Assembled furniture

Abstract

To provide modular furniture that can be easily assembled and disassembled. [Solution] The modular furniture 100 comprises a support section 10 for supporting people or articles, and a pair of side panels 40 that hold the support section 10. Each of the pair of side panels 40 is made of paper material. The support section 10 has a plurality of cylindrical sections 20, and each of the pair of side panels 40 has an opening 50. The pair of side panels 40 stand upright in the vertical direction and are arranged facing each other. One end 21 of each of the plurality of cylindrical sections 20 is inserted into the opening 50 of one side panel 40, and the other end 22 of each of the plurality of cylindrical sections 20 is inserted into the opening 50 of the other side panel 40, thereby connecting the pair of side panels 40 to each other via the plurality of cylindrical sections 20.

Description

Technical Field

[0001] The present invention relates to modular furniture.

Background Art

[0002] As modular furniture, for example, there is the one described in Patent Document 1. The modular furniture of Patent Document 1 has a plurality of cylindrical portions (described as tube bodies in the same document). When assembling the modular furniture, the plurality of cylindrical portions are arranged in parallel and joined to each other, thereby forming a support portion (described as a deck member in the same document) and a pair of side plate portions (described as leg members in the same document) for supporting the support portion, and joining the formed support portion and the pair of side plate portions to each other.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the modular furniture of Patent Document 1, when assembling the modular furniture, it is necessary to join the plurality of cylindrical portions to each other with an adhesive or the like. Therefore, there is room for improvement in the ease of assembling and disassembling the modular furniture.

[0005] The present invention has been made in view of the above problems, and provides modular furniture that can be easily assembled and disassembled.

Means for Solving the Problems

[0006] According to the present invention, there is provided modular furniture including a support portion for supporting a person or an article, and a pair of side plate portions for holding the support portion, each of the pair of side plate portions is made of a paper material, The support portion has a plurality of hollow cylindrical sections that are elongated in one direction, Each of the pair of side plates has one or more openings that penetrate the side plate in the thickness direction, The pair of side plates are positioned upright in the vertical direction and facing each other. The axial direction of each of the plurality of cylindrical portions is arranged along the opposing direction in which the pair of side plate portions face each other. The plurality of cylindrical portions are arranged in parallel in a direction that intersects the opposing direction in a plan view. The present invention provides an assembly-type piece of furniture in which one end of each of the plurality of cylindrical parts is inserted into the opening of one of the pair of side panels, and the other end of each of the plurality of cylindrical parts is inserted into the opening of the other of the pair of side panels, thereby connecting the pair of side panels to each other via the plurality of cylindrical parts. [Effects of the Invention]

[0007] According to the present invention, it becomes possible to assemble and disassemble prefabricated furniture more easily. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view of the assembled state of the modular furniture according to the embodiment. [Figure 2] This is a front view of the assembled state of the prefabricated furniture according to the embodiment. [Figure 3] This is a side view of the assembled state of the prefabricated furniture according to the embodiment. [Figure 4] This is a plan view of the assembled state of the prefabricated furniture according to the embodiment. [Figure 5] This is a plan view of the assembled state of a prefabricated piece of furniture according to an embodiment, showing an excerpt of the support part and its surrounding structure. [Figure 6] This is a side view of the side plate portion in the embodiment. [Figure 7] Figure 7(a) is a front view of the side plate portion in the embodiment, and Figure 7(b) is a partially enlarged view of portion A shown in Figure 7(a). [Figure 8]This is a magnified view of part A shown in Figure 3. [Figure 9] This is a magnified view of section A shown in Figure 3, with the multiple cylindrical parts omitted from the illustration. [Figure 10] This is a plan view (unfolded view) of the plate-shaped member in the embodiment, showing its state before folding. [Figure 11] Figure 11(a) is a plan view of the cylindrical portion in the embodiment, Figure 11(b) is a front view of the annular member in the embodiment, and Figure 11(c) shows the state in which the annular member is fitted onto the first cylindrical portion. [Figure 12] This is an exploded perspective view of the prefabricated furniture in the embodiment. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings. In all drawings, similar components are denoted by the same reference numerals, and their descriptions are omitted where appropriate. In this specification, unless otherwise specified, the positional relationships (up and down relationships, etc.) of the components of the prefabricated furniture 100 are described as being when the prefabricated furniture 100 is assembled as shown in Figures 1 to 4, with each of the pair of side panels 40 standing upright on a horizontal mounting surface. The positional relationships described in these descriptions do not necessarily correspond to the positional relationships of the prefabricated furniture 100 before assembly, during assembly, or during use. In the following description, the direction perpendicular to the vertical direction (the upright direction of the pair of side panels 40) may be referred to as the horizontal direction. Furthermore, within the horizontal direction, the direction in which the pair of side panels 40 face each other in the assembled state may be referred to as the left-right direction. In particular, in the assembled state, the direction that is one of the side panels 40 of the pair may be referred to as the right (right side), and the direction that is the other side panel 40 may be referred to as the left (left side). Note that, as will be described later, the assembled furniture 100 according to this embodiment is a chair as an example, and the right (right side) and left (left side) here refer to the right (right side) and left (left side) as viewed from the user sitting on the assembled furniture 100 (chair). Furthermore, the direction perpendicular to both the vertical direction (the upright direction of the pair of side panels 40) and the left-right direction (the facing direction of the pair of side panels 40) may be referred to as the front-back direction. Furthermore, in the left-right direction (the opposing directions of the pair of side panels 40), the central side of the assembled furniture 100 is referred to as the inner side, and the side opposite the inner side is referred to as the outer side. In addition, the positional relationships of each component of the prefabricated furniture 100 may be explained in each drawing. In this specification, “vertical direction,” “horizontal direction (including left-right and front-back directions),” “orthogonal,” “parallel,” and “vertical” include the range of error permissible in the art to which the present invention pertains. For example, in this specification, “vertical direction,” “horizontal direction (same as above),” “orthogonal,” “parallel,” and “vertical” mean, unless otherwise specified, within a range of less than ±10° from the exact vertical direction, exact horizontal direction, exact orthogonal direction, exact parallel direction, or exact vertical direction. The error from the exact vertical direction, exact horizontal direction, exact orthogonal direction, exact parallel direction, or exact vertical direction is preferably ±5° or less, and more preferably ±3° or less.

[0010] As shown in Figures 1 to 3, the prefabricated furniture 100 according to this embodiment includes a support part 10 for supporting people or articles, and a pair of side plate parts 40 that hold the support part 10. Each of the pair of side panels 40 is made of paper material. The support portion 10 has multiple (six in this embodiment) hollow cylindrical portions 20 that are elongated in one direction. Each of the pair of side plate portions 40 has one or a plurality of openings 50 penetrating the side plate portion 40 in the thickness direction. The pair of side plate portions 40 stand upright in the vertical direction and are arranged facing each other. The axial direction of each of the plurality of cylindrical portions 20 is arranged along a direction including a component in the facing direction (hereinafter simply referred to as the facing direction) in which the pair of side plate portions 40 face each other. Further, the plurality of cylindrical portions 20 are arranged in parallel in a direction intersecting the facing direction in a plan view. As shown in FIG. 5, one end portion 21 of each of the plurality of cylindrical portions 20 is inserted into the opening 50 of one of the pair of side plate portions 40, and the other end portion 22 of each of the plurality of cylindrical portions 20 is inserted into the opening 50 of the other side plate portion 40 of the pair of side plate portions 40, whereby the pair of side plate portions 40 are connected to each other via the plurality of cylindrical portions 20. Here, the statement that "each of the pair of side plate portions 40 is made of a paper material" means that at least the plate surfaces (outer surface 40b and inner surface 40c) of the side plate portions 40 are made of a paper material, and the side plate portions 40 may include, for example, portions made of materials other than the paper material. Further, here, the statement that "standing upright in the vertical direction" means that the plate surfaces (outer surface 40b and inner surface 40c) of the side plate portion 40 stand upright vertically or substantially vertically with respect to a horizontal placement surface. Further, here, the statement that "the pair of side plate portions 40 face each other" means that in addition to the plate surfaces of each of the pair of side plate portions 40 being arranged parallel to each other, the pair of side plate portions 40 may be arranged such that the normal directions of their respective inner surfaces 40c (opposing surfaces) intersect each other. In this case, for example, the angle formed by the normals of the respective inner surfaces 40c (opposing surfaces) of the pair of side plate portions 40 shall be 120 degrees or more and less than 240 degrees. Also, in this case, the "facing direction" is the extending direction of a virtual straight line connecting the inner surfaces 40c of the pair of side plate portions 40 at the shortest distance in a plan view. Also, here, the "direction intersecting the facing direction in plan view" does not necessarily have to be a direction orthogonal to the facing direction. In plan view, it is sufficient if the angle formed by a virtual straight line (not shown) extending in the arrangement direction of the plurality of cylindrical portions 20 and a virtual straight line (not shown) extending in the facing direction is 45 degrees or more and less than 135 degrees. Also, here, the "plurality of cylindrical portions 20 are arranged in parallel" means that, in addition to being arranged such that the extending directions of each of the plurality of cylindrical portions 20 are parallel to each other, adjacent cylindrical portions 20 may extend in directions intersecting each other. In this case, for example, the angle formed by adjacent cylindrical portions 20 shall be less than 30 degrees.

[0011] According to this embodiment, when assembling the modular furniture 100, by inserting one end portion 21 of each of the plurality of cylindrical portions 20 into the opening 50 of one of the pair of side plate portions 40 and inserting the other end portion 22 of each of the plurality of cylindrical portions 20 into the opening 50 of the other side plate portion 40 of the pair of side plate portions 40, the pair of side plate portions 40 can be connected to each other via the plurality of cylindrical portions 20. Also, the opening 50 can maintain a state in which the plurality of cylindrical portions 20 are arranged in parallel with each other well. Therefore, for example, the modular furniture 100 can be easily assembled without using an adhesive, tools, or the like. [[ID=?]] Also, when disassembling the modular furniture 100, by removing the plurality of cylindrical portions 20 from the opening 50, the connection between the pair of side plate portions 40 can be easily released. Thus, for example, the modular furniture 100 can be easily disassembled without using tools such as a saw or a utility knife. Furthermore, as described above, the pair of side plate portions 40 are made of a paper material. Therefore, compared with the case where the pair of side plate portions 40 are made of wood or a metal material, the pair of side plate portions 40 and thus the entire modular furniture 100 can be made lighter in weight. Therefore, it becomes easier to carry the modular furniture 100. Thus, according to this embodiment, the assembly and disassembly of the modular furniture 100 can be performed more easily.

[0012] In the present invention, the modular furniture 100 includes the assembled state (see Figures 1 to 4), the state before assembly, or the state in which the cylindrical part 20 has been removed from the side panel part 40 for disassembly or other purposes (see Figure 12). The prefabricated furniture 100 may be distributed and sold in an assembled state, or it may be distributed and sold in an unassembled state. In the assembled state, the lower end surfaces of each of the pair of side panels 40 become the contact surfaces 40a, and with these contact surfaces 40a positioned on a horizontal mounting surface, the pair of side panels 40 and thus the entire assembly furniture 100 stand on their own.

[0013] The embodiment will be described in more detail below. As shown in Figures 1 to 4, as an example, the modular furniture 100 according to this embodiment is a chair having a seat 12 as a support part 10, and comprises the above-mentioned pair of side plate parts 40 that hold the seat 12, a back part 80 composed of a plurality of third cylindrical parts 82, and a plurality of reinforcing pipes 70 that connect the pair of side plate parts 40 to each other. In this embodiment, the seat portion 12 is composed of a plurality of cylindrical portions 20. Each of the plurality of cylindrical portions 20 is, for example, a cylinder, and a portion of the outer circumferential surface of each cylindrical portion 20 constitutes the seating surface (upper surface) of the seat portion 12. Although Figures 1 to 4 show an example where the modular furniture 100 is a single-seater chair, the present invention is not limited to this example. For example, by appropriately setting the dimensions (length, outer diameter, and thickness, etc.) of each of the multiple cylindrical parts 20 that constitute the seat 12, and the number of such cylindrical parts 20, the modular furniture 100 can be made into a two-seater or three-seater chair.

[0014] In this invention, the modular furniture 100 is not limited to a chair, but may be a desk, a shelf, or the like. If the modular furniture 100 is a desk or a shelf, for example, the support part 10 may have a plurality of cylindrical parts 20 and flat plate members (not shown) arranged on the plurality of cylindrical parts 20, and the flat plate members may constitute a top plate or a shelf. Furthermore, even if the prefabricated furniture 100 is a chair, for example, the support part 10 may have a plurality of cylindrical parts 20 and a flat plate member (not shown) placed on the plurality of cylindrical parts 20, and the seat surface of the seat part 12 may be formed by the flat plate member.

[0015] As shown in Figures 1 and 12, each of the pair of side plates 40 is set to have the same shape and dimensions as the other. In the assembled state, the pair of side plates 40 are parallel to each other. Each of the pair of side plate portions 40 is formed in a flat plate shape and has a flat plate surface (outer surface 40b and inner surface 40c). As shown in Figures 3 and 6, the side view shape of each of the pair of side plate portions 40 is displaced downward in a roughly stepped manner toward the front. The upper end of the side panel 40 forms part of the back panel 80, and in the front-to-back direction, the dimensions of the upper end are smaller than the dimensions of the other parts of the side panel 40. With this configuration, the pair of side panel 40 can stand stably on their own while ensuring the vertical dimensions of the back panel 80. The stepped portion (arc-shaped portions 47d, 47e, 47f and straight portion 46, described later) in the middle (in the vertical direction) of the side panel portion 40 constitutes the armrest portion of the chair. The lower end surface of the lower end of the side plate portion 40 is the contact surface 40a that is placed on the mounting surface.

[0016] More specifically, as shown in Figures 3 and 6, each of the pair of side plate portions 40 has a lower edge portion 41a and a rear edge portion 41b extending in directions perpendicular to each other. The lower edge portion 41a extends linearly in the front-rear direction, and the rear edge portion 41b extends linearly in the up-down direction. The corner portion 41c between the lower edge portion 41a and the rear edge portion 41b has a rounded shape. Here, the front end of the lower edge portion 41a and the upper end of the rear edge portion 41b are connected to each other via a straight portion 46 and a plurality of arc-shaped portions 47. The side plate portion 40 includes arc-shaped portions 47a, 47b, 47c, straight portion 46, arc-shaped portion 47d, 47e, 47f, 47g, and 47h, which are arranged in this order from top to bottom. The arc-shaped portion 47a smoothly connects the upper end of the trailing edge portion 41b to the upper end of the arc-shaped portion 47b and is formed in an upwardly convex arc shape. The arc-shaped portion 47b smoothly connects one end of the arc-shaped portion 47a (the end opposite to the rear edge portion 41b) and the upper end of the arc-shaped portion 47c, and is formed in an arc shape that is slightly convex toward the rear. The arc-shaped portion 47c smoothly connects the lower end of the arc-shaped portion 47b and the rear end of the straight portion 46, and is formed in a convex arc shape that extends diagonally downward and rearward. The straight section 46 extends linearly in the front-rear direction. The straight section 46 smoothly connects the lower end of the arc-shaped section 47c and the upper end of the arc-shaped section 47d. The arc-shaped portion 47d smoothly connects the front end of the straight portion 46 and the upper end of the arc-shaped portion 47e, and is formed in a convex arc shape that extends diagonally upward and forward. The arc-shaped portion 47e smoothly connects the lower end of the arc-shaped portion 47d and the upper end of the arc-shaped portion 47f, and is formed in a convex arc shape that extends diagonally downward and backward. The arc-shaped portion 47f smoothly connects the lower end of the arc-shaped portion 47e and the upper end of the arc-shaped portion 47g, and is formed in a convex arc shape that extends diagonally upward and forward. The arc-shaped portion 47g smoothly connects the lower end of the arc-shaped portion 47f and the upper end of the arc-shaped portion 47h, and is formed in an arc shape that is convex toward the rear. The arc-shaped portion 47h smoothly connects the lower end of the arc-shaped portion 47g and the front end of the lower edge portion 41a, and is formed in a convex arc shape toward the front. Thus, the side view shape of each of the pair of side panels 40 is roughly stepped, but without any sharp corners. This ensures sufficient durability for the side panels 40, which are made of paper material. In this invention, the side view shape of each of the pair of side panels 40 is not limited to this example and can be appropriately set according to the intended use of the assembled furniture 100.

[0017] Here, each of the pair of side plate portions 40 includes one or more plate-like members 42 made of, for example, corrugated cardboard. The plate-shaped member 42 has one or more half-cut grooves 44 formed therein. Each of the pair of side plate sections 40 is composed of a plate-like member 42 that is folded along one or more half-cut grooves 44. With this configuration, a pair of side panels 40 can be easily made to have multiple layers (for example, at least two layers, one side portion 42a and the other side portion 42b (details to be described later) of the plate-shaped member 42). Here, the layers of the side panels 40 refer to layers made of corrugated cardboard, and the front liner, back liner, and core, which will be described later, are collectively considered as one layer. By having multiple layers in the side panels 40, the thickness dimension of the side panels 40 made of paper material (corrugated cardboard) can be secured well. Therefore, the structural strength of the side panels 40 can be improved. In addition, since the area of ​​the contact surface 40a of the side panels 40 can be secured well, the assembled furniture 100 can stand more stably on its own. More specifically, when forming multiple layers of the side panel 40, for example, one plate-shaped member 42 can be folded along a half-cut groove 44, and parts of the plate-shaped member 42 (one side portion 42a and the other side portion 42b) can be brought into surface contact with each other. Therefore, compared to the case where each layer of the side panel 40 is constructed by aligning and bonding individual corrugated cardboard sheets together, a side panel 40 with multiple layers can be formed more easily. Furthermore, with the above configuration, among the multiple layers of the side plate portion 40, the layers that are made up of a common plate-like member 42 are connected to each other via a part of the plate-like member 42 (in this embodiment, the core of the corrugated cardboard sheet described later). Therefore, even if an external force is applied to the end face of the side plate portion 40, it is possible to suppress the layers from shifting relative to each other in the planar direction.

[0018] More specifically, the corrugated cardboard sheet constituting the plate-like member 42 has a core, to which the front liner (one side of the corrugated cardboard sheet) is bonded in the thickness direction, and the back liner (the other side of the corrugated cardboard sheet) is bonded in the thickness direction. The core is formed in a corrugated shape. The direction along the corrugations of the core is called the "corrugation direction (grain direction)," and the direction perpendicular to this corrugation direction is called the "opposite corrugation direction." In Figure 3, a portion of the surface (front liner or back liner) of the plate-like member 42 is not shown, and the corrugations 120 and corrugation direction of the core are shown. The direction that is vertical in the assembled state is the corrugation direction. Also, in Figures 1, 2, 7(a), and 7(b), the end face of the plate-like member 42 (corrugated cardboard sheet) is schematically shown, and the core is not shown. The plate-like member 42 may be subjected to surface treatments such as heat-resistant coatings or weather-resistant coatings. Furthermore, when a known corrugated cardboard sheet is used as the plate-like member 42, its thickness is not particularly limited, and various known corrugated cardboard sheets with different specifications can be appropriately selected. The thickness dimension of the plate-like member 42 is preferably 3 mm or more and 5 mm or less, and specific examples of its thickness dimension include 3 mm, 4 mm, and 5 mm. However, in the present invention, the material of each of the pair of side panels 40 is not limited to this example. More specifically, the side panels 40 can be appropriately selected from known paper materials such as cardboard, in addition to corrugated cardboard, according to the specifications of the assembled furniture 100. That is, in the present invention, the side panels 40 may be made of a material that does not have the above-mentioned core, i.e., does not have a stepped direction. In this case, the side panels 40 may have a multi-layer structure or a single-layer structure.

[0019] In this embodiment, each of the pair of side plate portions 40 has a half-cut groove 44 formed therein, and the half-cut groove 44 is a straight groove formed on one or both sides of the corrugated cardboard sheet that constitutes the plate-like member 42. In the state before the plate-like member 42 is folded (see Figure 10), the half-cut groove 44 is formed at a position that divides the plate-like member 42 into two equal parts. More specifically, the half-cut groove 44 extends in a straight line from the upper edge to the lower edge of the plate-like member 42. The half-cut groove 44 penetrates the outer layer (front liner or back liner) of the corrugated cardboard sheet, but does not penetrate the core. In the plate-shaped member 42, one portion 42a and the other portion 42b are connected to each other via the core, with respect to the half-cut groove 44. Each of the two portions 42a and 42b is symmetrical with respect to the half-cut groove 44. More specifically, the external shape of each of the two portions 42a and 42b is formed in the same way as the external shape of the side plate portion 40 (excluding the cover portion 48 described later) in a side view (see Figure 6). With this configuration, the plate-like member 42 can be easily folded using the half-cut groove 44 as a folding line. More specifically, as shown in Figure 7(b), the plate-like member 42 is folded in half such that one portion 42a and the other portion 42b are in surface contact with each other. That is, two layers are formed from a single plate-like member 42. The one portion 42a and the other portion 42b are joined to each other via an adhesive layer (not shown). In the folded state, the outline of the one portion 42a and the outline of the other portion 42b coincide in a side view. However, in the present invention, the shape of the half-cut groove 44 is not limited to the above example, and may be a perforation including, for example, a plurality of straight cuts and a plurality of non-formed portions located between each cut and which are non-formed regions of the cut. Furthermore, in the present invention, for example, a plate-shaped member 42 may have a plurality of half-cut grooves 44 formed therein, and the plate-shaped member 42 may be folded multiple times along the plurality of half-cut grooves 44 (for example, folded into thirds). That is, for example, a single plate-shaped member 42 may constitute three or more layers.

[0020] As shown in Figures 7(a) and 7(b), each of the pair of side plate sections 40 is formed by stacking a plurality (for example, 5) of folded plate-like members 42 in the thickness direction (the thickness direction of the plate-like members 42). That is, each of the pair of side plate sections 40 has, for example, 10 layers. More specifically, in the stacking direction of the plate-shaped members 42 (hereinafter simply referred to as the stacking direction), an adhesive layer (not shown) is formed between each opposing surface of adjacent plate-shaped members 42, and these plate-shaped members 42 are joined to each other via this adhesive layer. When viewed in the stacking direction, the outlines of each of the multiple plate-like members 42 coincide with each other. Of the multiple plate-shaped members 42, one surface of the plate-shaped member 42 located on the furthest side in the stacking direction (the surface opposite to the adjacent plate-shaped member 42) constitutes the outer surface 40b of the side plate portion 40, and the other surface of the plate-shaped member 42 located on the far other side in the stacking direction (the surface opposite to the adjacent plate-shaped member 42) constitutes the inner surface 40c of the side plate portion 40. In this way, multiple plate-like members 42 constitute a single side plate portion 40. Each of the multiple openings 50 (and the multiple second openings 55 and the multiple third openings 56 described later) is formed by penetrating each of the multiple plate-like members 42. In this embodiment, the thickness dimension of each of the pair of side plates (the sum of the thickness dimensions of the multiple plate-shaped members 42) is preferably 0.5 to 3 times, and more preferably 0.9 to 2 times, the outer diameter of each of the multiple cylindrical parts 20. With this configuration, the depth dimension of the opening 50 (dimension D1 shown in Figure 5) can be secured well, so that the cylindrical portion 20 can be held more stably by the opening 50. In this invention, the number of plate-like members 42 constituting the side plate portion 40 is not limited to this example and can be appropriately set according to the desired thickness dimension and structural strength of the side plate portion 40.

[0021] Furthermore, in this embodiment, at least one of the one or more plate-shaped members 42 is arranged such that the direction of the corrugations of the corrugated cardboard sheet constituting the plate-shaped member 42 is aligned with the vertical direction. With this configuration, even when an external force is applied to the pair of side panels 40 in the vertical direction, the shape of the side panels 40 can be maintained well. Therefore, the pair of side panels 40, and consequently the entire assembly furniture 100, can be more reliably kept upright. In this embodiment, as an example, the corrugated cardboard sheets of each of the multiple plate-shaped members 42 are arranged so that the direction of the corrugations aligns with the vertical direction. This makes it possible to further improve the structural strength of the side plate portion 40 against external forces in the vertical direction. However, the present invention is not limited to this example, and the plurality of plate-shaped members 42 may include both plate-shaped members 42 arranged so that the direction of the corrugated cardboard sheets is aligned with the vertical direction, and plate-shaped members 42 arranged so that the direction of the corrugated cardboard sheets is aligned with the horizontal direction (in this embodiment, the front-to-back direction). In this case, for example, in the stacking direction, plate-shaped members 42 arranged so that the direction of the corrugated cardboard sheets is aligned with the vertical direction, and plate-shaped members 42 arranged so that the direction of the corrugated cardboard sheets is aligned with the horizontal direction (same as above), may be arranged alternately.

[0022] Furthermore, as shown in Figures 1 to 3, each of the pair of side plate portions 40 has a cover portion 48 that covers the end face of each plate-shaped member 42 from the upper end to the middle portion of the side plate portion 40. With this configuration, for example, even if the prefabricated furniture 100 is installed outdoors, deterioration of the side panels 40 due to rain and wind can be suppressed. The cover portion 48 is formed in a long, strip-like shape in one direction. One surface of the cover portion 48 is joined to the end surface of the side plate portion 40 (each end surface of the multiple plate-like members 42) via an adhesive (not shown). The width dimension of the cover portion 48 is set to be approximately the same as the thickness dimension of the side plate portion 40, and one surface of the cover portion 48 covers the entire area of ​​the side plate portion 40 in the thickness direction. More specifically, as shown in Figure 3, the cover portion 48 is arranged along the curved portion 47a, the curved portion 47b, the curved portion 47c, the straight portion 46, the curved portion 47d, the curved portion 47e, the curved portion 47f, and the boundary between the curved portion 47f and the curved portion 47g. That is, in a side view, the cover portion 48 is curved in an arc shape in multiple directions along the multiple curved portions 47. With this configuration, for example, even if water droplets adhere to the side plate portion 40 during rainy weather, the water droplets can be quickly allowed to drip down along the cover portion 48. In this embodiment, the rear end surface and lower end surface (contact surface 40a) of the side plate portion 40 are areas where the cover portion 48 is not placed. However, the present invention is not limited to this example, and the cover portion 48 may be placed on the rear end surface and lower end surface of these side plate portions 40.

[0023] The cover portion 48 is, for example, made of corrugated cardboard. The direction of the corrugations of the cover portion 48 is, for example, the same as the thickness direction of the side plate portion 40. This allows the cover portion 48 to bend flexibly along multiple arc-shaped portions 47 and straight portions 46. Similar to the plate-shaped member 42, the cover portion 48 may be subjected to surface treatment such as a heat-resistant and weather-resistant coating. However, in the present invention, the material of the cover portion 48 is not particularly limited. More specifically, the material of the cover portion 48 can be appropriately selected from known paper materials such as cardboard, in addition to corrugated cardboard. Furthermore, the material of the cover portion 48 is not limited to the above-mentioned paper materials, but may also be a resin material such as plastic.

[0024] As shown in Figures 3 and 6, in this embodiment, one of the openings 50 in each of the pair of side plate portions 40 is, for example, an elongated hole 52 that is perpendicular to the opposing direction in a plan view. The elongated hole 52 is a through hole that penetrates the side plate portion 40 in the thickness direction. In the assembled state, one end 21 of each of the multiple cylindrical parts 20 is inserted into the elongated hole 52 of one side plate 40, and the other end 22 of each of the multiple cylindrical parts 20 is inserted into the elongated hole 52 of the other side plate 40. The elongated hole 52 is formed in the middle of the side plate portion 40, and the seat portion 12 (multiple cylindrical portions 20) of the assembled furniture 100 is held by the middle portion of the pair of side plate portions 40. In this embodiment, the axial direction of each of the multiple cylindrical parts 20 is arranged along the opposing direction (in this embodiment, the left-right direction). Furthermore, the multiple cylindrical parts 20 are arranged in parallel in a direction perpendicular to the opposing direction (in this embodiment, the front-back direction) when viewed from above. More specifically, the elongated hole 52 extends in a direction that includes, for example, a component in the front-to-back direction. Also, the depth direction of the elongated hole 52 coincides with the opposing direction. Therefore, when inserted into the elongated hole 52, each of the multiple cylindrical portions 20 is positioned with its axial direction aligned with the opposing direction in which the pair of side plate portions 40 face each other, and is also arranged in parallel in a direction perpendicular to the opposing direction in a plan view. In a plan view, each of the multiple cylindrical parts 20 is arranged parallel to the others in the front-to-back direction. However, the present invention is not limited to this example, and the axial directions of the multiple cylindrical portions 20 only need to be arranged along a direction that includes at least a component in the opposing direction. Similarly, the multiple cylindrical portions 20 only need to be arranged in parallel in a direction that intersects at least the opposing direction in a plan view.

[0025] As shown in Figures 6 and 12, each of the pair of side plate portions 40 further has a plurality of second openings 55 and a plurality of third openings 56. Each of the plurality of second openings 55 is a through hole that penetrates the side plate portion 40 in the thickness direction. Similarly, each of the plurality of third openings 56 is a through hole that penetrates the side plate portion 40 in the thickness direction. In a side view, each of the multiple second openings 55 is circular in shape. Similarly, in a side view, each of the multiple third openings 56 is circular in shape. Multiple reinforcing pipes 70 are inserted into multiple second openings 55, and multiple third cylindrical parts 82 that constitute the back portion 80 are inserted into multiple third openings 56. More specifically, each of the pair of side plate sections 40 has the same number of second openings 55 as there are reinforcing pipes 70. One end of one reinforcing pipe 70 is inserted into one second opening 55 of one of the pair of side plate sections 40, and the other end of the reinforcing pipe 70 is inserted into one second opening 55 of the other side plate section 40 of the pair. Similarly, each of the pair of side plate portions 40 has the same number of third openings 56 as the number of third cylindrical portions 82. One end of one third cylindrical portion 82 is inserted into one third opening 56 of one of the pair of side plate portions 40, and the other end of the third cylindrical portion 82 is inserted into one third opening 56 of the other side plate portion 40 of the pair of side plate portions 40. As shown in Figure 6, as an example, in the side plate portion 40, of the multiple (for example, three) second openings 55, two second openings 55 are formed below the elongated hole 52, and the remaining second opening 55 is formed above the elongated hole 52. The two second openings 55 are spaced apart from each other in the front-rear direction, and the centers of each of the two second openings 55 are aligned on the same straight line. Multiple (for example, five) third openings 56 are formed at the upper end of the side plate portion 40. The multiple third openings 56 are arranged at equal intervals from each other in the vertical direction. In a side view, a virtual line (not shown) connecting the centers of each of the multiple third openings 56 extends in a direction that includes a vertical component and is a slightly convex arc towards the rear. With this configuration, the user's back is well supported by multiple third cylindrical parts 82 over a wider range in the vertical direction, while the backrest 80 is well-ventilated because the third cylindrical parts 82 are spaced apart from each other. Therefore, the seating comfort of the assembled furniture 100 (chair) can be improved.

[0026] In this embodiment, each of the pair of side panels 40 is distributed and sold as part of a prefabricated furniture 100, having a plurality of plate-like members 42 stacked on top of each other, a cover portion 48 that covers a part of the end face of each of the plurality of plate-like members 42, and a plurality of openings 50 to a third opening 56 (see Figures 6, 7(a), and 12). That is, when assembling the prefabricated furniture 100, the side panels 40 in the state shown in Figures 6, 7(a), and 12 are used.

[0027] Here, as shown in Figure 11(a), each of the multiple cylindrical parts 20 (in this embodiment, the first cylindrical part 25 and the second cylindrical part 26, which will be described later) is a paper tube. The paper tube is formed by stacking layers of multiple spirally wound paper substrates 23 on top of each other. That is, the paper tube is a spiral paper tube having multiple wound parts 23a. Note that, except for Figure 11(a), the winding parts 23a of the paper substrates 23 are not shown. With this configuration, even when an external force is applied in a direction perpendicular to the axial direction of the cylindrical portion 20 (up and down direction), the shape of the cylindrical portion 20 (paper tube) can be well maintained. Furthermore, when disposing of the assembled furniture 100, the cylindrical portion 20 can be easily disassembled along the boundary between the wound portions 23a of the paper base material 23. An adhesive layer (not shown) is formed between the layers of the multiple paper substrates 23, and the layers of the multiple paper substrates 23 are joined to each other via this adhesive layer. In addition, the boundaries between the winding portions 23a of each layer of the paper substrates 23 are positioned offset from each other in the axial direction. This improves the structural strength of the cylindrical portion 20. Here, it is preferable that the width dimension L1 of the paper substrate 23 (dimension of the winding portion 23a in the axial direction) (see Figure 11(a)) is greater than the depth dimension D1 of the opening 50 (thickness dimension of the side plate portion 40). With this configuration, when an external force is applied in a direction perpendicular to the axial direction of the cylindrical portion 20 (up and down direction), it is possible to suppress the concentration of stress at the boundary between the wound portions 23a of the paper base material 23 at each of the ends 21 and 22 of the cylindrical portion 20. Therefore, the shape of the cylindrical portion 20 (paper tube) can be maintained well. In this invention, the plurality of tubular portions 20 are not limited to spiral paper tubes, but may be, for example, flat-wound paper tubes, or the plurality of tubular portions 20 may include both spiral paper tube tubular portions 20 and flat-wound paper tube tubular portions 20.

[0028] Furthermore, as shown in Figure 8, for at least two cylindrical parts 20 that are adjacent to each other among the multiple cylindrical parts 20, the distance between the two cylindrical parts 20 in the direction of alignment is 1 / 2 or less of the thickness dimension of the cylindrical parts 20. This configuration improves the seating comfort of the seat portion 12, which is composed of multiple cylindrical portions 20. Furthermore, if the assembled furniture 100 is a desk or shelf, items can be placed more stably on the support portion 10. In this embodiment, for each of the multiple cylindrical portions 20, the distance between adjacent cylindrical portions 20 in the direction of alignment is 1 / 2 or less of the thickness dimension of the cylindrical portion 20. In this context, "the direction in which the cylindrical parts 20 are arranged" refers to the direction of extension of a hypothetical straight line (not shown) connecting the centers of the cylindrical parts that are adjacent to each other when viewed from the side (when viewed in the opposite direction). Furthermore, the "distance between the two cylindrical parts 20 in the direction of alignment" here refers to the minimum distance between the outer surfaces of the two cylindrical parts 20 in the direction of alignment. Furthermore, "less than or equal to 1 / 2 of the thickness dimension of the cylindrical portion 20" means that if the thickness dimensions of adjacent cylindrical portions 20 are different, the cylindrical portion 20 with the relatively larger thickness dimension is used as the reference.

[0029] In this embodiment, as described above, at least one of the one or more openings 50 is an elongated hole 52 that is perpendicular to the opposing direction in a plan view. One end 21 of at least two of the multiple cylindrical parts 20 is inserted into the elongated hole 52 of one side plate 40, and the other end 22 of at least two of the multiple cylindrical parts 20 is inserted into the elongated hole 52 of the other side plate 40. This makes it easy to make the distance between at least two adjacent cylindrical parts 20 in the direction of alignment substantially zero. In other words, it makes it easy to make at least two adjacent cylindrical parts 20 in the direction of alignment in the direction of alignment in the direction of alignment. More specifically, in this embodiment, as described above, one end 21 of each of the multiple cylindrical parts 20 is inserted into the elongated hole 52 of one side plate 40, and the other end 22 of each of the multiple cylindrical parts 20 is inserted into the elongated hole 52 of the other side plate 40. As a result, as shown in Figure 8, the distance between adjacent cylindrical parts 20 in the direction of alignment can be made virtually zero. In other words, it becomes easy to make each of the multiple cylindrical parts 20 in contact with each other (line contact) in the direction of alignment. With this configuration, the user's weight can be distributed and supported by multiple cylindrical parts 20, thereby improving the comfort of the seat 12. In addition, if the assembled furniture 100 is a desk or shelf in addition to a chair, it is possible to prevent small items from falling out through the gaps between adjacent cylindrical parts 20.

[0030] Furthermore, the elongated hole 52 includes, for example, a plurality of fitting portions 53 that are arranged in a direction perpendicular to the opposing direction in a plan view and are connected to one another. As shown in Figures 8 and 9, one cylindrical portion 20 fits into one fitting portion 53. With this configuration, it is possible to maintain a good spacing between the cylindrical portions 20 that are arranged adjacent to each other in the direction of alignment.

[0031] As shown in Figures 8 and 9, each of the multiple fitting portions 53 includes at least one arc portion 54, the radius of curvature of which is equal to the radius of curvature of the outer surface of the cylindrical portion 20. With this configuration, the cylindrical portion 20 of the cylinder can be held securely by the fitting portion 53. More specifically, the multiple (e.g., six) fitting portions 53 are arranged in a direction that includes a front-to-back component. Of the multiple fitting portions 53, the fitting portion 53a located on the far side in the direction of arrangement (the direction in which the multiple fitting portions 53 are arranged) and the fitting portion 53f located on the far side are symmetrical with respect to the center of the elongated hole 52. The fitting portions 53a and 53f are composed of a single arc portion 54, the central angle of which is, for example, 270 degrees or more and less than 360 degrees. In a side view, the arc portion 54 of fitting portion 53a is open toward the rear, and the arc portion 54 of fitting portion 53b is open toward the front. Of the multiple fitting portions 53, fitting portions 53b, 53c, 53d, and 53e, which are positioned between fitting portion 53a and fitting portion 53f in the direction of alignment (the direction in which the multiple fitting portions 53 are aligned), have the same shape as each other. More specifically, each of fitting portions 53b to 53e is composed of a pair of upper and lower arc portions 54. In a side view, of the pair of upper and lower arc portions 54, the upper arc portion 54 is a convex arc that points upward, and the lower arc portion 54 is a convex arc that points downward. The central angle of each of the pair of upper and lower arc portions 54 is, for example, 90 degrees or more and less than 180 degrees. The distance between the vertices of each of the pair of upper and lower arc portions 54 is set to be, for example, equivalent to the outer diameter of the cylindrical portion 20. The cylindrical portion 20 that fits into the fitting portions 53b to 53e is held between a pair of upper and lower arc portions 54. The boundaries between the arc sections 54 of each fitting section 53a to 53f are each arc-shaped, and adjacent arc sections 54 are smoothly connected to each other. Thus, in this embodiment, the side view shape of the elongated hole 52 is such that multiple arc portions 54 are smoothly connected to one another. In this invention, the side view shapes of the elongated hole 52 and the fitting portion 53 are not limited to this example and can be appropriately set according to the shape and outer diameter of the cylindrical portion 20. Furthermore, the number of fitting portions 53 in the elongated hole 52 is not limited to this example, but it is preferable that the elongated hole 52 has at least the same number of fitting portions 53 as the cylindrical portion 20 that is inserted into the elongated hole 52.

[0032] In the present invention, the structure of the support portion 10 is not limited to this example. For example, the support portion 10 may be composed solely of a structure in which one cylindrical portion 20 is inserted into one opening 50, or the support portion 10 may be composed of a combination of a structure in which one cylindrical portion 20 is inserted into one opening 50 and a structure in which multiple cylindrical portions 20 are inserted into another opening 50 (elongated hole 52) separate from the said opening 50.

[0033] Here, as shown in Figure 5, the modular furniture 100 further includes a movement restricting section 60 provided on at least one of the multiple cylindrical sections 20. The movement restricting section 60 restricts at least the cylindrical section 20 on which the movement restricting section 60 is provided from moving inward in the direction opposite to the side plate section 40. With this configuration, displacement (and consequently detachment) of the cylindrical portion 20 in the axial direction (opposing direction) is suppressed, and the state in which the cylindrical portion 20 is inserted into the opening 50 (elongated hole 52) can be maintained in good condition.

[0034] More specifically, as shown in Figure 5, the plurality of cylindrical portions 20 include, for example, a first cylindrical portion 25 provided with a movement restricting portion 60, and a second cylindrical portion 26 not provided with a movement restricting portion 60. In the direction of arrangement of the multiple cylindrical portions 20 (in this embodiment, the direction including the front-to-back component), the first cylindrical portion 25 and the second cylindrical portion 26 are arranged adjacent to each other. Here, the movement restricting section 60 is, for example, a pair of annular members 62. Of the pair of annular members, one annular member 62 is fitted onto one end 21 of the first cylindrical portion 25, and the other annular member 62 is fitted onto the other end 22 of the first cylindrical portion 25. The second cylindrical portion 26 is positioned between a pair of annular members 62 that are fitted onto the first cylindrical portion 25 adjacent to the second cylindrical portion 26 in the opposing direction (in this embodiment, the left-right direction). One annular member 62 is positioned along the outer surface 40b (right side in this embodiment) of one side plate portion 40, and when viewed in the opposite direction (side view), it is positioned to overlap with one end surface 26a of the second cylindrical portion 26 adjacent to the first cylindrical portion 25 into which the annular member 62 is fitted. Similarly, the other annular member 62 is positioned along the outer surface 40b (left side in this embodiment) of the other side plate portion 40, and as shown in Figure 8, when viewed in the opposite direction (same as above), it is positioned to overlap with the other end surface 26b of the second cylindrical portion 26 adjacent to the first cylindrical portion 25 into which the annular member 62 is fitted. In this context, "overlapping arrangement" means that, when viewed in the opposite direction, at least a portion of the annular member 62 overlaps with the end faces (one end face 26a, the other end face 26b) of the second cylindrical portion 26 adjacent to the first cylindrical portion 25 into which the annular member 62 is fitted. With this configuration, the pair of annular members 62 abut against the outer surface 40b of the corresponding side plate portion 40, thereby restricting the movement of the first cylindrical portion 25 relative to the side plate portion 40 in opposing directions (both inward and outward). Furthermore, at least one of the end faces 26a and 26b of the second cylindrical portion 26 abuts against the corresponding annular member 62, thereby restricting the movement of the second cylindrical portion 26 relative to the side plate portion 40 in opposing directions (same as above). Moreover, since interference between the pair of annular members 62 and the second cylindrical portion 26 can be suppressed in the direction in which the cylindrical portions 20 are aligned, the first cylindrical portion 25 and the second cylindrical portion 26 can be arranged in close proximity to each other (for example, so as to be in line contact). Furthermore, even if an external force is applied to the first cylindrical portion 25 in the vertical direction, the pair of annular members 62 prevents the first cylindrical portion 25 from falling off (bending of the first cylindrical portion 25 is suppressed). As a result, the distance between the pair of side plate portions 40 in the opposing direction is maintained, so that the second cylindrical portion 26 can remain held by the pair of side plate portions 40. Furthermore, during assembly, one annular member 62 (or the other annular member 62) can restrict the first cylindrical portion 25 from moving inward relative to one side plate portion 40 (or the other side plate portion 40), thus facilitating the positioning of the first cylindrical portion 25 relative to the pair of side plate portions 40.

[0035] In this invention, the movement restricting portion 60 is not limited to a pair of annular members 62, but may also be, for example, an adhesive applied to the inner circumferential surface of the opening 50 or the outer circumferential surface of the cylindrical portion 20, a friction structure between the inner circumferential surface of the opening 50 and the outer circumferential surface of the cylindrical portion 20, or an uneven structure such as a flange formed on the side plate portion 40 and the cylindrical portion 20.

[0036] As shown in Figure 5, the plurality of cylindrical portions 20 include, for example, a plurality of first cylindrical portions 25 and a plurality of second cylindrical portions 26. The seat portion 12 is formed by these plurality of first cylindrical portions 25 and a plurality of second cylindrical portions 26. In this case, it is preferable that, in the direction in which the multiple cylindrical portions 20 are arranged, at least one first cylindrical portion 25 is arranged adjacent to each second cylindrical portion 26. With this configuration, for each second cylindrical portion 26, the annular member 62 of at least one adjacent first cylindrical portion 25 can be made to abut against the end face (one end face 26a, the other end face 26b) of the second cylindrical portion 26. More specifically, in this embodiment, the number of first cylindrical parts 25 and the number of second cylindrical parts 26 included in the plurality of cylindrical parts 20 are equal (for example, 3), and in the direction of arrangement of the plurality of cylindrical parts 20, one first cylindrical part 25 and one second cylindrical part 26 are arranged alternately and repeatedly. With this configuration, as shown in Figures 5 and 8, for each second cylindrical portion 26 in the direction in which the multiple cylindrical portions 20 are arranged (excluding the first or last second cylindrical portion 26 in that direction (for example, the rear end in Figure 8)), one first cylindrical portion 25 can be placed on each side of that second cylindrical portion 26 in that direction. This allows the annular members 62 of two adjacent first cylindrical portions 25 to contact the end faces (one end face 26a, the other end face 26b) of each second cylindrical portion 26 on the central side, where the user's weight is particularly heavily loaded. Therefore, the relative movement of these central second cylindrical portions 26 in the direction opposite to the side plate portion 40 can be more reliably restricted. In this embodiment, as shown in Figures 8 and 9, the first cylindrical portion 25 is fitted into the fitting portions 53a, 53c, and 53e, respectively, and the second cylindrical portion 26 is fitted into the fitting portions 53b, 53d, and 53f, respectively. The first cylindrical portion 25 and the second cylindrical portion 26, which are arranged adjacent to each other, are in contact (line contact) with each other in the direction of their alignment. However, the present invention is not limited to this example, and for example, the number of first cylindrical parts 25 and the number of second cylindrical parts 26 included in the cylindrical part 20 may be different from each other. It is sufficient that the first cylindrical portion 25 (annular member 62) is adjacent to at least one side of the second cylindrical portion 26 in the front-rear direction. Therefore, for example, the number of second cylindrical portions 26 included in the cylindrical portion 20 may be greater than the number of first cylindrical portions 25. In this case, for example, in the direction in which the multiple cylindrical portions 20 are arranged, one first cylindrical portion 25 and two second cylindrical portions 26 may be arranged alternately and repeatedly in this order. Even with this configuration, each second cylindrical portion 26 can be positioned adjacent to one first cylindrical portion 25, so that the annular member 62 of the first cylindrical portion 25 can restrict the relative movement of each second cylindrical portion 26 in the direction opposite to the side plate portion 40. Furthermore, for example, the number of first cylindrical parts 25 included in the multiple cylindrical parts 20 may be greater than the number of second cylindrical parts 26. In this case, for example, it is preferable that, in the direction in which the multiple cylindrical parts 20 are arranged, one first cylindrical part 25 and one second cylindrical part 26 are alternately and repeatedly arranged, and that the first cylindrical parts 25 are positioned at the front and rear (the end closest to one end and the other end in the direction in which they are arranged). With this configuration, each second cylindrical portion 26 can be positioned with a first cylindrical portion 25 on either side in the direction of alignment. This allows the annular members 62 of the adjacent first cylindrical portions 25 to more reliably restrict the relative movement of each second cylindrical portion 26 in the direction opposite to the side plate portion 40.

[0037] The outer and inner diameters of each of the multiple first cylindrical portions 25 are constant regardless of their position in the axial direction. Similarly, the outer and inner diameters of each of the multiple second cylindrical portions 26 are constant regardless of their position in the axial direction. Multiple first cylindrical portions 25 are set to the same dimensions as each other. Similarly, multiple second cylindrical portions 26 are set to the same dimensions as each other. The outer diameter of the first cylindrical portion 25 is set to be the same as the outer diameter of the second cylindrical portion 26. Similarly, the inner diameter of the first cylindrical portion 25 is set to be the same as the inner diameter of the second cylindrical portion 26. On the other hand, the length dimension of the first cylindrical portion 25 is greater than the length dimension of the second cylindrical portion 26. More specifically, as shown in Figure 5, one end of the first cylindrical portion 25 protrudes outward from the elongated hole 52 of one side plate portion 40, and one annular member 62 is fitted onto this protruding portion. Similarly, the other end of the first cylindrical portion 25 protrudes outward from the elongated hole 52 of the other side plate portion 40, and the other annular member 62 is fitted onto this protruding portion. Preferably, a portion of the inner surface 62a of one annular member 62 is in surface contact with the outer surface 40b of one side plate portion 40, and a portion of the inner surface 62a of the other annular member 62 is in surface contact with the outer surface 40b of the other side plate portion 40. On the other hand, it is preferable that one end face 26a of the second cylindrical portion 26 is flush with the outer surface 40b of one side plate portion 40, and a portion of this end face 26a is in surface contact with the inner surface 62a of one annular member 62. Similarly, it is preferable that the other end face 26b of the second cylindrical portion 26 is flush with the outer surface 40b of the other side plate portion 40, and a portion of this other end face 26b is in surface contact with the inner surface 62a of the other annular member 62. With this configuration, the movement of the first cylindrical portion 25 relative to the side plate portion 40 is restricted in opposing directions (both inward and outward), and the movement of the second cylindrical portion 26 relative to the side plate portion 40 is restricted in opposing directions (same as above). In this invention, the multiple first cylindrical portions 25 may be set to different dimensions from each other. Similarly, the multiple second cylindrical portions 26 may be set to different dimensions from each other. Furthermore, the outer diameter of the first cylindrical portion 25 may be set to a different dimension from the outer diameter of the second cylindrical portion 26. Similarly, the inner diameter of the first cylindrical portion 25 may be set to a different dimension from the inner diameter of the second cylindrical portion 26.

[0038] Furthermore, the thickness dimension (difference between the outer diameter and inner diameter) of each of the pair of annular members 62 is preferably 0.3 times or more and 2 times or less the thickness dimension (same as above) of the second cylindrical portion 26, and more preferably 0.5 times or more and 1.5 times or less the thickness dimension (same as above) of the second cylindrical portion 26. With this configuration, in a side view, a good overlap area can be secured between the annular member 62 and the end faces (one end face 26a, the other end face 26b) of the second cylindrical portion 26 adjacent to the first cylindrical portion 25 into which the annular member 62 is fitted. Therefore, the annular member 62 can more reliably suppress the movement of the second cylindrical portion 26 relative to the side plate portion 40 in the opposing direction. In this embodiment, as an example, the thickness of each of the pair of annular members 62 is equivalent to the thickness of the second cylindrical portion 26.

[0039] Each of the pair of annular members 62 is, for example, made of paper. This configuration improves the recyclability of the prefabricated furniture 100. Furthermore, it makes the disposal of the prefabricated furniture 100 easier. More specifically, as shown in Figure 11(b), each of the pair of annular members 62 is a cylindrical paper tube. The axial dimension of the annular member 62 is smaller than the outer diameter of the annular member 62. Furthermore, both end faces (outer and inner surfaces 62a) of the pair of annular members 62 are flat surfaces and are perpendicular to the axis of the annular member 62. As shown in Figure 11(c), the inner diameter of each of the pair of annular members 62 is set to be equal to the outer diameter of the first cylindrical portion 25. This allows the annular members 62 to fit well with the first cylindrical portion 25.

[0040] Here, the radius of curvature of the virtual surface 201 (see Figure 8) passing through the upper ends of each of the multiple cylindrical portions 20 is greater than the radius of curvature of the outer surface of the cylinder. Note that "virtual surface 201" as used here refers to either a single plane or a single curved surface. This configuration improves the seating comfort of the seat portion 12, which is composed of multiple cylindrical portions 20. Furthermore, if the assembled furniture 100 is a desk or shelf, items can be placed more stably on the support portion 10.

[0041] One example of a virtual surface 201 is a curved surface. In this embodiment, at least a portion of the virtual surface 201 is curved convexly in a direction that includes a downward component, for example. This configuration allows the seat 12 to better fit the curves of a person's buttocks. More specifically, the multiple cylindrical sections 20 are designated as cylindrical section 20a, cylindrical section 20b, cylindrical section 20c, cylindrical section 20d, cylindrical section 20e, and cylindrical section 20f, in order from front to back (see Figure 8). Of these, the upper ends of the two front cylindrical sections 20a and 20b are positioned at the same height relative to each other in the vertical direction. Similarly, the upper ends of the three rear cylindrical sections 20d, 20e, and 20f are positioned at the same height relative to each other in the vertical direction. Here, "at the same height relative to each other" means that the vertical distance between the centers of the cylindrical sections 20 in question is less than 1 / 4 of the minimum width dimension of the elongated hole 52 (the dimension in the direction perpendicular to the extending direction of the elongated hole 52), preferably less than 1 / 6 of the minimum width dimension, and more preferably less than 1 / 8 of the minimum width dimension. Furthermore, the upper ends of the two front cylindrical sections 20a and 20b are positioned slightly above the upper ends of the three rear cylindrical sections 20d, 20e, and 20f. In addition, in the vertical direction, the upper end of the central cylindrical section 20c (the center in the direction in which the cylindrical sections 20 are arranged) is positioned between the upper ends of the two front cylindrical sections 20a and 20b and the upper ends of the three rear cylindrical sections 20d, 20e, and 20f. With this configuration, the virtual surface 201 passing through the upper end of each of the multiple cylindrical portions 20 can be made into a curved surface shape that is slightly displaced downward toward the rear and curves convexly toward the direction including the downward component. In this invention, the curved shape of the virtual surface 201 is not limited to this example, and the virtual surface 201 may be, for example, a semi-cylindrical surface or a wave surface. If the virtual surface 201 is a wave surface, the minimum value of the radius of curvature of the virtual surface 201 is greater than the radius of curvature of the outer surface of the cylindrical portion 20.

[0042] More specifically, as shown in Figure 9, in this embodiment, the centers C1 and C2 of the two front fitting portions 53a and 53b are positioned at the same height relative to each other in the vertical direction. Similarly, the centers C4, C5, and C6 of the three rear fitting portions 53d, 53e, and 53f are positioned at the same height relative to each other in the vertical direction. Here, "at the same height relative to each other" means that the vertical distance between the centers of the respective fitting portions 53 is less than 1 / 4 of the minimum width dimension of the elongated hole 52 (the dimension in the direction perpendicular to the extending direction of the elongated hole 52), preferably less than 1 / 6 of the minimum width dimension, and more preferably less than 1 / 8 of the minimum width dimension. Furthermore, the centers C1 and C2 of the two front fitting portions 53a and 53b are located slightly above the centers C4, C5, and C6 of the three rear fitting portions 53d, 53e, and 53f, respectively. Furthermore, the center C3 of the central fitting portion 53c (the center in the extending direction of the elongated hole 52) is positioned in the vertical direction between the centers C1 and C2 of the two front fitting portions 53a and 53b, and the centers C4, C5, and C6 of the three rear fitting portions 53d, 53e, and 53f, respectively. Thus, in this embodiment, the centers of at least two of the multiple fitting portions 53 are positioned offset from each other in the vertical direction. This allows the virtual surface 201 to have a curved shape. The present invention is not limited to this example, and the centers of the multiple fitting portions 53 may be arranged on the same straight line as each other in a side view. In this case, the virtual surface 201 can be a flat surface shape.

[0043] In this embodiment, the multiple (for example, five) third cylindrical parts 82 are also cylindrical paper tubes (spiral paper tubes), similar to the multiple cylindrical parts 20. As described above, one end of the third cylindrical portion 82 is inserted into one third opening 56 of one of the pair of side plate portions 40, and the other end of the third cylindrical portion 82 is inserted into one third opening 56 of the other side plate portion 40 of the pair of side plate portions 40. The inner diameter of the third opening 56 is set to be the same as the outer diameter of the third cylindrical portion 82. As described above, the multiple third cylindrical parts 82 constitute the back portion 80, and these multiple third cylindrical parts 82 are positioned above the seat portion 12 (multiple cylindrical parts 20) in the side plate portion 40. Each of the multiple third cylindrical portions 82 connects, for example, the upper ends of a pair of side plate portions 40 to each other. The multiple third cylindrical portions 82 are spaced apart from each other and arranged at equal intervals in the vertical direction. In addition, in a side view, the multiple third cylindrical portions 82 are arranged to be slightly displaced forward and downward. More specifically, the imaginary surface (not shown) passing through the front ends of the multiple third cylindrical portions 82 has a slightly convex curved shape towards the rear in a side view. In this invention, the number of third cylindrical parts 82 provided by the modular furniture 100 is not limited to this example and can be appropriately set according to the desired vertical dimensions of the backrest 80, etc. In this invention, the plurality of third tubular portions 82 are not limited to spiral paper tubes, but may be, for example, flat-wound paper tubes, or the plurality of third tubular portions 82 may include both third tubular portions 82 of spiral paper tubes and third tubular portions 82 of flat-wound paper tubes.

[0044] Furthermore, the modular furniture 100 includes a pair of third annular members 84 that restrict the third cylindrical portion 82 from moving inward in the direction opposite to the side plate portion 40. Of the pair of third annular members 84, one third annular member 84 is fitted onto one end of the third cylindrical portion 82, and the other third annular member 84 is fitted onto the other end of the third cylindrical portion 82. One third annular member 84 is positioned along the outer surface 40b of one side plate portion 40, and the other third annular member 84 is positioned along the outer surface 40b of the other side plate portion 40. With this configuration, similar to the first cylindrical portion 25, the third cylindrical portion 82 is restricted from moving relative to the side plate portion 40 in opposing directions (both inward and outward). More specifically, one end of the third cylindrical portion 82 protrudes outward from the third opening 56 of one side plate portion 40, and one third annular member 84 is fitted onto this protruding portion. Similarly, the other end of the third cylindrical portion 82 protrudes outward from the third opening 56 of the other side plate portion 40, and the other third annular member 84 is fitted onto this protruding portion. The inner diameter of each of the pair of third annular members 84 is set to be the same as the outer diameter of the third cylindrical portion 82. This allows the third annular members 84 to fit well with the third cylindrical portion 82. Furthermore, both end faces (outer and inner surfaces 84a) of the pair of third annular members 84 are flat surfaces and are perpendicular to the axis of the third annular member 84. Preferably, a portion of the inner surface 84a of one of the third annular members 84 is in surface contact with the outer surface 40b of one of the side plate portions 40, and a portion of the inner surface 84a of the other third annular member 84 is in surface contact with the outer surface 40b of the other side plate portion 40. With this configuration, the movement of the third cylindrical portion 82 relative to the side plate portion 40 in opposing directions (both inward and outward) is restricted.

[0045] The multiple (for example, three) reinforcing tubes 70 are also cylindrical paper tubes (spiral paper tubes), similar to the multiple tubular sections 20 and the multiple third tubular sections 82. As described above, one end of a reinforcing pipe 70 is inserted into one of the second openings 55 of one of the pair of side plate portions 40, and the other end of the reinforcing pipe 70 is inserted into one of the second openings 55 of the other of the pair of side plate portions 40. The inner diameter of the second opening 55 is set to be the same as the outer diameter of the reinforcing pipe 70. As shown in Figure 3, the multiple reinforcing pipes 70 are positioned at intervals from the multiple cylindrical parts 20 (seat parts 12) in the vertical direction. Here, "spaced apart in the vertical direction" means that the entire reinforcing pipe 70 is positioned differently from the entirety of the multiple cylindrical sections 20 in the vertical direction. With this configuration, even when an external force is applied to the support part 10 (seat part 12) in the vertical direction, the entire assembly furniture 100 can be more reliably maintained in an upright position. More specifically, the multiple reinforcing pipes 70 include a reinforcing pipe 70 (one reinforcing pipe 70 in this embodiment) positioned above the multiple cylindrical portions 20, and a reinforcing pipe 70 (two reinforcing pipes 70 in this embodiment) positioned below the multiple cylindrical portions 20. In this invention, the number of reinforcing pipes 70 provided by the prefabricated furniture 100 is not limited to this example; for example, the number of reinforcing pipes 70 provided by the prefabricated furniture 100 may be one. Furthermore, in the present invention, the plurality of reinforcing tubes 70 are not limited to spiral paper tubes, but may be, for example, flat-wound paper tubes, or the plurality of third cylindrical parts 82 may include both spiral paper tube reinforcing tubes 70 and flat-wound paper tube reinforcing tubes 70.

[0046] Furthermore, the prefabricated furniture 100 includes a pair of second annular members 72 that restrict the reinforcing pipe 70 from moving inward in the direction opposite to the side plate portion 40. Of the pair of second annular members 72, one second annular member 72 is fitted onto one end of the reinforcing pipe 70, and the other second annular member 72 is fitted onto the other end of the reinforcing pipe 70. One second annular member 72 is positioned along the outer surface 40b of one side plate portion 40, and the other second annular member 72 is positioned along the outer surface 40b of the other side plate portion 40. With this configuration, similar to the first cylindrical portion 25, the reinforcing pipe 70 is restricted from moving relative to the side plate portion 40 in opposing directions (both inward and outward). More specifically, one end of the reinforcing pipe 70 protrudes outward from the second opening 55 of one side plate portion 40, and one second annular member 72 is fitted onto this protruding portion. Similarly, the other end of the reinforcing pipe 70 protrudes outward from the second opening 55 of the other side plate portion 40, and the other second annular member 72 is fitted onto this protruding portion. The inner diameter of each of the pair of second annular members 72 is set to be the same as the outer diameter of the reinforcing pipe 70. This allows the second annular members 72 to fit well with the reinforcing pipe 70. Furthermore, both end faces (outer and inner surfaces 84a) of the pair of second annular members 72 are flat surfaces and are perpendicular to the axis of the second annular member 72. Preferably, a portion of the inner surface 72a of one second annular member 72 is in surface contact with the outer surface 40b of one side plate portion 40, and a portion of the inner surface 72a of the other second annular member 72 is in surface contact with the outer surface 40b of the other side plate portion 40. With this configuration, the reinforcing pipe 70 is restricted from moving relative to the side plate portion 40 in opposing directions (both inward and outward).

[0047] Furthermore, in this embodiment, the entire assembly furniture 100 is constructed from paper material. This configuration improves the recyclability of the prefabricated furniture 100. Furthermore, it makes the disposal of the prefabricated furniture 100 easier. More specifically, in addition to the pair of side plates 40, the multiple cylindrical parts 20, the pair of annular members 62, the multiple third cylindrical parts 82, and the multiple reinforcing pipes 70, the pair of second annular members 72 and the pair of third annular members 84 are also made of paper material. Each of the pair of second annular members 72 is a cylindrical paper tube. The axial dimension of the second annular member 72 is smaller than the outer diameter of the second annular member 72. Similarly, each of the pair of third annular members 84 is a cylindrical paper tube. The axial dimension of the third annular member 84 is smaller than the outer diameter of the third annular member 84. However, the present invention is not limited to this example, and it is sufficient that at least the side plate portion 40 is made of paper material. Therefore, for example, any or all of the pair of side plate portions 40, the plurality of cylindrical portions 20, the pair of annular members 62, the plurality of third cylindrical portions 82, the plurality of reinforcing pipes, the pair of second annular members 72 and the pair of third annular members 84 may be made of a material other than paper material, such as a resin material.

[0048] The following describes how to assemble the prefabricated furniture 100. Please note that the assembly method described below is merely one example, and the order in which each part of the prefabricated furniture 100 is assembled is not particularly limited. As shown in Figure 12, in the pre-assembled furniture 100, the pair of side panels 40, the multiple cylindrical parts 20, the pair of annular members 62, the reinforcing pipe 70, the pair of second annular members 72, the multiple third cylindrical parts 82, and the pair of third annular members 84 are separated from each other. When assembling the modular furniture 100, first, the pair of side panels 40 are connected to each other by the reinforcing pipe 70. This makes it easy to maintain a desired distance between the pair of side panels 40 during the assembly of the modular furniture 100. Next, one first cylindrical part 25 is fitted to each of the fitting parts 53 of the pair of side panels 40, and one annular member 62 is fitted onto one end of the first cylindrical part 25. Then, one second cylindrical part 26 is fitted to each of the fitting parts 53 of the pair of side panels 40. At this time, one end face 26a of the second cylindrical part 26 abuts against the inner surface 62a of the annular member 62 fitted onto one end of the first cylindrical part 25. This positions the second cylindrical part 26 relative to the pair of side panels 40. Next, the other annular member 62 is fitted onto the other end of the first cylindrical part 25. As a result, in the opposing direction, the second cylindrical portion 26 is sandwiched between the pair of annular members 62 fitted onto the first cylindrical portion 25. By repeating this operation multiple times, the pair of side plate portions 40 are connected to each other via the multiple cylindrical portions 20 (multiple first cylindrical portions 25 and multiple second cylindrical portions 26), and a support portion 10 (seat portion 12) is formed. Next, multiple third cylindrical portions 82 connect the pair of side plate portions 40 to each other and form the back portion 80. In this way, in this embodiment, the modular furniture 100 is assembled without using adhesive. For this reason, in the assembled state, the pair of annular members 62 are detachable from the first cylindrical portion 25. Similarly, the pair of second annular members 72 are detachable from the reinforcing pipe 70, and the pair of third annular members 84 are detachable from the third cylindrical portion 82. As a result, when disassembling the modular furniture 100, the pair of annular members 62 can be easily removed from the first cylindrical part 25. Similarly, the pair of second annular members 72 can be easily removed from the reinforcing pipe 70, and the pair of third annular members 84 can be easily removed from the third cylindrical part 82. Therefore, it becomes easy to remove the multiple cylindrical parts 20 from the opening 50 and to release the connection between the pair of side plate parts 40 via the multiple cylindrical parts 20. Similarly, it becomes easy to remove the reinforcing pipe 70 from the second opening 55 and to release the connection between the pair of side plate parts 40 via the reinforcing pipe 70, and it also becomes easy to remove the third cylindrical part 82 from the third opening 56 and to release the connection between the pair of side plate parts 40 via the multiple third cylindrical parts 82. Thus, according to this embodiment, the assembly and disassembly of the modular furniture 100 can be made easier. However, in the present invention, the modular furniture 100 may be assembled using an adhesive. More specifically, the adhesive may be applied to the inner circumferential surface of the opening 50 or to the inner surface 62a of the pair of annular members 62, for example. Even in such a case, according to this embodiment, the multiple cylindrical parts 20 can be positioned relative to each other by the opening 50 (more specifically, the multiple fitting parts 53 of the elongated hole 52), making it easy to assemble the modular furniture 100. Furthermore, the opening 50 (as above) minimizes the number of parts joined via adhesive in the modular furniture 100, making it easy to disassemble the modular furniture 100.

[0049] The embodiments have been described above with reference to the drawings, but these are merely examples of the present invention, and various other configurations can also be adopted.

[0050] For example, the shape of the multiple cylindrical parts 20 is not limited to a cylinder, but may be a rectangular tube, for example. In this case, the upper surfaces of each cylindrical part 20 (rectangular tube) can form a substantially flat seating surface (upper surface). Also, if the multiple cylindrical parts 20 are rectangular tubes, the side view shape of the elongated hole 52 may be a rectangle that is elongated in one direction. Similarly, the shape of each of the multiple reinforcing pipes 70 and the multiple third cylindrical parts 82 is not limited to a cylinder, but may be, for example, a rectangular tube.

[0051] This embodiment encompasses the following technical concepts. (1) A piece of modular furniture comprising a support section for supporting people or objects, and a pair of side panels for holding the support section, Each of the pair of side panels is made of paper material. The support portion has a plurality of hollow cylindrical sections that are elongated in one direction, Each of the pair of side plates has one or more openings that penetrate the side plate in the thickness direction, The pair of side plates are positioned upright in the vertical direction and facing each other. The axial direction of each of the plurality of cylindrical portions is arranged along a direction that includes a component in the opposing direction in which the pair of side plate portions face each other. The plurality of cylindrical portions are arranged in parallel in a direction that intersects the opposing direction in a plan view. Assembled furniture in which one end of each of the plurality of cylindrical parts is inserted into the opening of one of the pair of side panels, and the other end of each of the plurality of cylindrical parts is inserted into the opening of the other of the pair of side panels, thereby connecting the pair of side panels to each other via the plurality of cylindrical parts. (2) The assembly furniture according to (1), wherein the plurality of cylindrical parts are arranged in parallel in a direction perpendicular to the opposing direction in a plan view. (3) Each of the pair of side panels includes one or more plate-like members made of corrugated cardboard, The assembly furniture according to (1) or (2), wherein at least one of the one or more plate-shaped members is arranged such that the direction of the corrugations of the corrugated cardboard sheet constituting the plate-shaped member is aligned with the vertical direction. (4) Each of the plurality of cylindrical parts is a paper tube, The aforementioned paper tube is formed by laminating multiple layers of paper substrates that are wound spirally together. This is an assembly-type furniture according to any one of (1) to (3). (5) The assembly furniture according to any one of (1) to (4), wherein, of the plurality of cylindrical parts, at least two cylindrical parts that are adjacent to each other, the distance between the two cylindrical parts in the direction of alignment is 1 / 2 or less of the thickness dimension of the cylindrical parts. (5-1) The assembly furniture according to (5), wherein, for each of the plurality of cylindrical parts, the distance between adjacent cylindrical parts in the direction of arrangement is 1 / 2 or less of the thickness dimension of the cylindrical part. (6) At least one of the one or more openings is an elongated hole in a direction perpendicular to the opposing direction in a plan view, The assembly furniture according to (5), wherein at least two or more cylindrical parts from the plurality of cylindrical parts are inserted into the elongated hole of one side plate, and the other ends of at least two or more cylindrical parts from the plurality of cylindrical parts are inserted into the elongated hole of the other side plate. (7) The elongated hole includes a plurality of fitting portions that are arranged in a direction perpendicular to the opposing direction in a plan view and are connected to one another, The assembly furniture according to (6), wherein one cylindrical part fits into one of the aforementioned fitting parts. (7-1) Each of the plurality of cylindrical parts is a cylinder, Each of the aforementioned plurality of fitting portions includes at least one arc portion, The assembly furniture described in (7), wherein the radius of curvature of the arc portion is equal to the radius of curvature of the outer surface of the cylindrical portion. (8) Further comprising a movement restricting portion provided in at least one of the plurality of cylindrical portions, The assembly furniture according to any one of (1) to (7), wherein the movement restricting portion restricts at least the cylindrical portion on which the movement restricting portion is provided from moving inward in the direction opposite to the side plate portion. (9) The plurality of cylindrical parts include a first cylindrical part on which the movement restricting part is provided and a second cylindrical part on which the movement restricting part is not provided, In the direction in which the plurality of cylindrical portions are arranged, the first cylindrical portion and the second cylindrical portion are arranged adjacent to each other. The aforementioned movement restricting portion is a pair of annular members, Of the pair of annular members, one annular member is fitted onto one end of the first cylindrical portion, and the other annular member is fitted onto the other end of the first cylindrical portion. The second cylindrical portion is positioned between the pair of annular members that are fitted onto the first cylindrical portion adjacent to the second cylindrical portion in the opposing direction. The one annular member is positioned along the outer surface of the one side plate portion and, when viewed in the opposing direction, is positioned to overlap with one end face of the second cylindrical portion adjacent to the first cylindrical portion into which the annular member is fitted. The assembly furniture according to (8), wherein the other annular member is arranged along the outer surface of the other side plate portion and, when viewed in the opposing direction, is arranged to overlap with the other end face of the second cylindrical portion adjacent to the first cylindrical portion into which the annular member is fitted. (9-1) The plurality of cylindrical parts include a plurality of first cylindrical parts and a plurality of second cylindrical parts, The assembly furniture according to (9), wherein in the direction of arrangement of the plurality of cylindrical parts, one first cylindrical part and one second cylindrical part are repeatedly arranged alternately. (9-2) The assembly furniture according to (9), wherein the thickness of each of the pair of annular members is 0.3 times or more and 2 times or less the thickness of each of the second cylindrical parts. (10) The assembly furniture according to (9), wherein each of the pair of annular members is made of paper material. (11) Each of the pair of side plate sections includes one or more plate-shaped members, The plate-like member has one or more half-cut grooves formed therein. The assembly furniture according to any one of (1) to (10), wherein each of the pair of side panels is made up of the plate-like member folded along the one or more half-cut grooves. (11-1) Each of the pair of side plate portions is formed by stacking a plurality of plate-like members, each folded along the one or more half-cut grooves, in the thickness direction of the plate-like members. The assembly furniture according to (11), wherein the thickness of each of the pair of side plates is 0.5 times or more and 3 times or less the outer diameter of each of the plurality of cylindrical parts. (12) Further comprising one or more reinforcing pipes that are elongated in one direction, The one or more reinforcing pipes connect the pair of side plate sections to each other. The assembly furniture according to any one of (1) to (11), wherein the one or more reinforcing pipes are positioned at intervals from the plurality of cylindrical portions in the vertical direction. (12-1) The assembly furniture according to (12), wherein the plurality of reinforcing pipes include a reinforcing pipe positioned above the plurality of cylindrical portions and a reinforcing pipe positioned below the plurality of cylindrical portions. (13) The assembly furniture is a chair having a seat as the support part, Each of the aforementioned plurality of cylindrical parts is a cylinder, Each of the aforementioned plurality of cylindrical parts constitutes the seat portion, The assembly furniture according to any one of (1) to (12), wherein the radius of curvature of the virtual surface passing through the upper end of each of the plurality of cylindrical parts is greater than the radius of curvature of the outer surface of the cylinder. (14) The assembly furniture described in (13), wherein the virtual surface is a curved surface. (14-1) The assembly furniture according to (14), wherein at least a portion of the virtual surface is curved convexly toward a direction including a downward component. [Explanation of symbols]

[0052] 10 Support part 12 Seat 20 Cylindrical part 21 One end 22 Other end 23 Paper base material 23a Winding section 25 First cylindrical part 26 Second cylindrical part 26a One end face 26b Other end surface 40 Side plate part 40a ground plane 40b External surface 40c inner 41a Lower edge 41b Trailing edge 42 Plate-shaped member 42a One side 42b The other side 44 Half-cut grooves 46 Straight section 47, 47a~47i arcuate part 48 Cover section 50 openings 52 Slotted holes 53, 53a~53f mating part 54 Arc section 55 Second opening 56 Third opening 60 Movement Restriction Department 62 Annular member 62a Inner surface 70 Reinforcement pipes 72 Second annular member 72a Inner surface 80 back 82 Third cylindrical part 84 Third annular member 84a Inner surface 100 Assembled Furniture 120th row 201 Virtual Surface

Claims

1. A prefabricated piece of furniture comprising a support section for supporting people or objects, and a pair of side panels for holding the support section, Each of the pair of side panels is made of paper material. The support portion has a plurality of hollow cylindrical sections that are elongated in one direction, Each of the pair of side plates has one or more openings that penetrate the side plate in the thickness direction. The pair of side plates are positioned upright in the vertical direction and facing each other. The axial direction of each of the plurality of cylindrical portions is arranged along a direction that includes a component in the opposing direction in which the pair of side plate portions face each other. The plurality of cylindrical portions are arranged in parallel in a direction that intersects the opposing direction in a plan view. Assembled furniture in which one end of each of the plurality of cylindrical parts is inserted into the opening of one of the pair of side panels, and the other end of each of the plurality of cylindrical parts is inserted into the opening of the other of the pair of side panels, thereby connecting the pair of side panels to each other via the plurality of cylindrical parts.

2. The assembly furniture according to claim 1, wherein the plurality of cylindrical parts are arranged in parallel in a direction perpendicular to the opposing direction in a plan view.

3. Each of the pair of side panels includes one or more plate-like members made of corrugated cardboard. The modular furniture according to claim 1 or 2, wherein at least one of the one or more plate-like members is arranged such that the direction of the corrugations of the corrugated cardboard sheet constituting the plate-like member is aligned with the vertical direction.

4. Each of the aforementioned cylindrical parts is a paper tube, The assembly furniture according to claim 1 or 2, wherein the paper tube is formed by laminating multiple layers of paper substrates that are wound in a spiral shape onto each other.

5. The modular furniture according to claim 1 or 2, wherein, with respect to at least two of the plurality of cylindrical parts that are arranged adjacent to each other, the distance between the two cylindrical parts in the direction in which they are aligned is 1 / 2 or less of the thickness dimension of the cylindrical parts.

6. At least one of the one or more openings is an elongated hole that is perpendicular to the opposing direction in a plan view. The assembly furniture according to claim 5, wherein at least two or more cylindrical parts from the plurality of cylindrical parts are inserted into the elongated hole of one side plate, and the other ends of at least two or more cylindrical parts from the plurality of cylindrical parts are inserted into the elongated hole of the other side plate.

7. The aforementioned elongated hole includes a plurality of fitting portions that are arranged in a direction perpendicular to the opposing direction in a plan view and are connected to one another, The assembly furniture according to claim 6, wherein one cylindrical portion is fitted into one of the fitting portions.

8. The system further includes a movement restricting portion provided in at least one of the plurality of cylindrical portions, The assembly furniture according to claim 1 or 2, wherein the movement restricting portion restricts at least the cylindrical portion on which the movement restricting portion is provided from moving inward in the direction opposite to the side plate portion.

9. The plurality of cylindrical portions include a first cylindrical portion on which the movement restricting portion is provided, and a second cylindrical portion on which the movement restricting portion is not provided. In the direction in which the plurality of cylindrical portions are arranged, the first cylindrical portion and the second cylindrical portion are arranged adjacent to each other. The aforementioned movement restricting portion is a pair of annular members, Of the pair of annular members, one annular member is fitted onto one end of the first cylindrical portion, and the other annular member is fitted onto the other end of the first cylindrical portion. The second cylindrical portion is positioned between the pair of annular members that are fitted onto the first cylindrical portion adjacent to the second cylindrical portion in the opposing direction. The one annular member is positioned along the outer surface of the one side plate portion and, when viewed in the opposing direction, is positioned to overlap with one end face of the second cylindrical portion adjacent to the first cylindrical portion into which the annular member is fitted. The assembly furniture according to claim 8, wherein the other annular member is arranged along the outer surface of the other side plate portion and, when viewed in the opposing direction, is arranged to overlap with the other end face of the second cylindrical portion adjacent to the first cylindrical portion into which the annular member is fitted.

10. The assembly furniture according to claim 1 or 2, wherein each of the pair of annular members is made of paper material.

11. Each of the pair of side plate sections includes one or more plate-like members. The plate-like member has one or more half-cut grooves formed therein. The assembly furniture according to claim 1 or 2, wherein each of the pair of side panels is made up of the plate-like member folded along the one or more half-cut grooves.

12. The system further comprises one or more elongated reinforcing pipes in one direction, The one or more reinforcing pipes connect the pair of side plate sections to each other. The assembly furniture according to claim 1 or 2, wherein the one or more reinforcing pipes are positioned at intervals from the plurality of cylindrical portions in the vertical direction.

13. The assembly furniture in question is a chair having a seat as the support part, Each of the aforementioned plurality of cylindrical parts is a cylinder, Each of the aforementioned plurality of cylindrical parts constitutes the seat portion, The assembly furniture according to claim 1 or 2, wherein the radius of curvature of the virtual surface passing through the upper ends of each of the plurality of cylindrical parts is greater than the radius of curvature of the outer surface of the cylinder.

14. The assembly furniture according to claim 13, wherein the virtual surface has a curved shape.

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