chair

Abstract

To improve durability of a chair that comprises a leg member and a core material formed of a resin foam body.SOLUTION: A chair having a seat part comprises a core material, a leg support member, and at least one leg member. The core material, which is formed of a resin foam body, constitutes at least a part of the seat part. The leg support member is fixed to the core material. The leg member is supported by the leg support member. The leg support member has a fixing part that is held by the core material from upper and lower sides within the core material.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a chair. [Background technology]

[0002] To reduce the weight of chairs and improve the flexibility of their shapes, foamed resin such as polystyrene foam is sometimes used as the core material of chairs. Furthermore, chairs are sometimes provided with leg members to improve the interior design and to secure a space between the core material and the floor surface to improve breathability. Conventionally, chairs have been known in which a plate material is bonded to the underside of a core material made of foamed resin, and leg members are fixed to the plate material (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-102583 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, foamed resins have poor adhesion to other materials and are prone to internal delamination. Therefore, in a chair having a core formed from the foamed resin and a plate bonded to the underside thereof and legs fixed to the plate, when stress is generated in the core and the plate due to a person sitting on the chair, vertical and / or horizontal misalignment may occur between the core and the plate, causing the plate to delaminate and fall off the core, or internal delamination may occur near the interface between the core and the plate, resulting in damage to the core. Thus, conventional chairs having a core formed from a foamed resin and leg members have a problem in that it is difficult to ensure sufficient durability.

[0005] This specification discloses a technique that can solve the above-mentioned problems. [Means for solving the problem]

[0006] The technology disclosed in this specification can be realized, for example, in the following forms.

[0007] (1) The chair disclosed in this specification is a chair having a seat portion, and includes a core material, a leg support member, and at least one leg member. The core material is formed from a foamed resin body and constitutes at least a part of the seat portion. The leg support member is fixed to the core material. The leg member is supported by the leg support member. The leg support member has a fixing portion sandwiched between the core material from above and below inside the core material.

[0008] In this chair, the leg support members that support the leg members have fixing portions that are sandwiched between the core material from above and below. Therefore, when stress is generated in the core material and the leg support members due to a person sitting on the chair, the fixing portions can prevent vertical and / or horizontal misalignment between the core material and the leg support members. Therefore, this chair can prevent the leg support members from peeling off and falling off the core material due to such misalignment, or prevent internal peeling near the interface between the core material and the leg support members, which could damage the core material. As a result, the durability of the chair can be improved.

[0009] (2) In the chair, the fixed portion of the leg support member may have a portion made up of a plurality of rod-shaped portions connected to each other. With this configuration, the presence of the fixed portion improves the durability of the chair, while suppressing an increase in the weight of the fixed portion compared to a configuration in which the fixed portion has a flat plate-shaped portion, thereby suppressing an increase in the weight of the chair.

[0010] (3) In the chair, the portion formed of the plurality of interconnected rod-shaped portions may be a frame-shaped portion having through holes formed therethrough in the vertical direction. With this configuration, the presence of the frame-shaped portion of the fixed portion effectively improves the durability of the chair, while suppressing an increase in the weight of the fixed portion compared to a configuration in which the fixed portion has a flat plate-shaped portion, thereby suppressing an increase in the weight of the chair.

[0011] (4) In the chair described above, the fixing portion of the leg support member may have a substantially flat portion that is substantially perpendicular to the up-down direction. This configuration increases the contact area between the fixing portion of the leg support member and the core material, and the presence of the fixing portion effectively prevents misalignment between the core material and the leg support member. Therefore, this configuration effectively prevents the leg support member from peeling off and falling off the core material due to the misalignment, or prevents internal peeling near the interface between the core material and the leg support member, which could damage the core material, thereby effectively improving the durability of the chair.

[0012] (5) In the chair described above, the fixing portion of the leg support member may have a mesh-like portion with a large number of through-holes extending vertically. This configuration increases the contact area between the fixing portion of the leg support member and the core material while suppressing an increase in the weight of the leg support member and, ultimately, the weight of the chair. The presence of the fixing portion effectively suppresses misalignment between the core material and the leg support member. Therefore, this configuration effectively prevents the leg support member from peeling off and falling off the core material due to such misalignment, or prevents internal peeling near the interface between the core material and the leg support member, thereby effectively improving the durability of the chair.

[0013] (6) In the above chair, the leg support member may further include a lower stage portion disposed below the fixed portion, the lower stage portion having a lower surface exposed from the lower surface of the core material and supporting the leg member, and a connecting portion connecting the fixed portion and the lower stage portion. With this configuration, the presence of the fixed portion improves the durability of the chair, and the presence of the lower stage portion having a lower surface exposed from the lower surface of the core material makes it easy to support the leg member with the leg support member regardless of the shape of the core material.

[0014] (7) In the chair, the lower stage of the leg support member may have a frame-like portion with a through-hole formed therethrough in the vertical direction. With this configuration, the presence of the lower stage makes it easy to support the leg member with the leg support member, while suppressing an increase in the weight of the lower stage portion compared to a configuration in which the lower stage portion has a flat plate-like portion, thereby suppressing an increase in the weight of the chair.

[0015] (8) In the chair described above, a second region defined by the outline of the lower portion of the leg support member may be configured to include a first region defined by the outline of the fixed portion of the leg support member and to have a larger area than the first region when viewed from above. With this configuration, the load transmitted downward from the seat surface due to a person sitting can be effectively distributed by transmitting the load to the leg members through a wider area of ​​the leg support member and core material, thereby effectively improving the durability of the chair.

[0016] (9) In the chair, the lower portion of the leg support member may have a main portion and a protruding portion protruding from the main portion in a substantially horizontal direction, and the leg member may be supported by the protruding portion. With this configuration, the load transmitted downward from the seat surface due to a person sitting can be transmitted to the leg member through a wider area of ​​the leg support member and the core material, thereby effectively dispersing the load and effectively improving the durability of the chair.

[0017] The technology disclosed in this specification can be realized in various forms, for example, in the form of a chair and a manufacturing method thereof. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is an explanatory diagram illustrating a schematic configuration of a chair 100 according to a first embodiment. [Figure 2] FIG. 1 is an explanatory diagram illustrating a schematic configuration of a chair 100 according to a first embodiment. [Figure 3] FIG. 1 is an explanatory diagram illustrating a schematic configuration of a chair 100 according to a first embodiment. [Figure 4] FIG. 1 is an explanatory diagram illustrating a schematic configuration of a chair 100 according to a first embodiment. [Figure 5] FIG. 1 is an explanatory diagram illustrating a schematic configuration of a chair 100 according to a first embodiment. [Figure 6] FIG. 1 is an explanatory diagram illustrating a schematic configuration of a chair 100 according to a first embodiment. [Figure 7] FIG. 1 is an explanatory diagram illustrating a schematic configuration of a chair 100 according to a first embodiment. [Figure 8] FIG. 10 is an explanatory diagram showing a detailed configuration of a leg support member 40 in the first embodiment. [Figure 9] FIG. 10 is an explanatory diagram conceptually illustrating the configuration of a leg support member 40a in a second embodiment. [Figure 10] FIG. 10 is an explanatory diagram conceptually illustrating the configuration of a leg support member 40b in a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] A. First embodiment: A-1. Composition of chair 100: 1 to 7 are explanatory diagrams schematically illustrating the configuration of a chair 100 according to a first embodiment. FIG. 1 illustrates the front configuration of the chair 100, FIG. 2 illustrates the side configuration of the chair 100, FIG. 3 illustrates the top configuration of the chair 100, FIG. 4 illustrates the bottom configuration of the chair 100, FIG. 5 illustrates the YZ cross-sectional configuration of the chair 100 at position VV in FIG. 1, FIG. 6 illustrates the XZ cross-sectional configuration of the chair 100 at position VI-VI in FIG. 2, and FIG. 7 illustrates the external configuration of each member constituting the chair 100. Each figure illustrates mutually orthogonal X, Y, and Z axes for specifying directions. The positive Z-axis direction is the upward direction, the negative Z-axis direction is the downward direction, the positive Y-axis direction is the forward direction, and the negative Y-axis direction is the backward direction. The X-axis direction is the left-right direction.

[0020] Chair 100 is a so-called sofa-type single-seater chair, and is installed and used in, for example, homes, offices, stores, hotels, public facilities, etc. Chair 100 has a height H1 of, for example, 700 mm or more and 800 mm or less (more specifically, about 750 mm), a left-right width W1 of chair 100 of, for example, 530 mm or more and 630 mm or less (more specifically, about 580 mm), and a front-to-back depth D1 of chair 100 of, for example, 500 mm or more and 600 mm or less (more specifically, about 550 mm).

[0021] Chair 100 comprises seat 102 and back 104. Seat 102 has seat surface 103 and is the portion that primarily supports the buttocks of the seated person. Seat surface 103 is inclined so that it gradually decreases from the front to the rear (see FIG. 5). This prevents the seated person's pelvis from sliding forward and makes it easier for the seated person to lean against back 104. The height from the floor of the front end of seat surface 103 is set to, for example, 380 mm to 480 mm (more specifically, approximately 430 mm) so that the seated person's feet can easily reach the floor. The height from the floor of the rear end of seat surface 103 is lower than the front end of seat surface 103, and is set to, for example, 350 mm to 450 mm (more specifically, approximately 400 mm). The front surface of seat 102 curves backward so that the center is recessed (see FIG. 3). This allows the legs of the seated person to be accommodated in the recessed portion, reducing the burden on the knees of the seated person. Also, the shape of the seat part 102 when viewed from the top and bottom is a roughly trapezoidal shape that becomes wider from side to side as it moves forward.

[0022] The back portion 104 has a backrest surface 105 and is the portion that mainly supports the back of the seated person. The back portion 104 extends upward from near the rear end of the seat portion 102. The back portion 104 is shaped so that the left and right ends protrude forward (see Figure 3). This makes the backrest surface 105 approximately U-shaped, preventing the seated person from shifting left or right and allowing the occupant to place their hands on it to make standing up easier. The angle between the backrest surface 105 and the seat surface 103 is set to about 80 degrees. This allows the backrest surface 105 and the seat surface 103 to effectively distribute body pressure. The angle between backrest surface 105 and seat surface 103 is measured as the angle between the tangent to backrest surface 105 at point X1 and the tangent to seat surface 103 at point X2, where point A is the boundary between backrest surface 105 and seat surface 103 at the center of the left-right direction of chair 100, point X1 is a position 10 cm away from point A along backrest surface 105, and point X2 is a position 12 cm away from point A along seat surface 103.

[0023] As shown in FIGS. 5 to 7, the chair 100 includes, as its constituent members, a core member 10, a cushion member 20, leg members 30, leg support members 40, and a cover member 60.

[0024] The core material 10 is a member that functions as a core that determines the general shape of the seat portion 102 and the back portion 104, and is formed from a foamed resin. A foamed resin is a porous body formed by finely dispersing gas in resin and molding it into a foamed shape. For example, polystyrene foam or urethane foam can be used as the foamed resin for forming the core material 10. In this embodiment, polystyrene foam is used as the foamed resin for forming the core material 10. By forming the core material 10 from a foamed resin, it is possible to reduce the weight of the core material 10 (and therefore the chair 100) and improve the freedom of shape. The lower surface (bottom surface) of the core material 10 is a substantially horizontal plane.

[0025] The cushion material 20 is disposed on the surfaces of the core material 10 corresponding to the seat surface 103 and the backrest surface 105, and is a member for softening the seat surface 103 and the backrest surface 105. In this embodiment, the cushion material 20 is composed of a lower cushion material 21 and an upper cushion material 22 (see FIG. 7). The lower cushion material 21 is disposed on the surface of the core material 10 corresponding to the seat surface 103, and is made of, for example, chip urethane. The upper cushion material 22 is disposed from the upper surface of the lower cushion material 21 to the surface of the core material 10 corresponding to the backrest surface 105, and is made of, for example, urethane foam.

[0026] The cover member 60 is a member that covers the structure formed by the core material 10 and the cushion material 20, covering the surface of the structure, and is made of, for example, cloth. The presence of the cover member 60 prevents the core material 10 and the cushion material 20 from getting dirty, and can impart a cool or warm feeling to the seat surface 103 and the backrest surface 105. The cover member 60 may cover the entire surface of the structure, or may cover the structure so that part of the surface of the structure (for example, part of the underside) is exposed. A fastener 62 is provided on the back of the cover member 60. When the cover member 60 is attached, the fastener 62 is in a closed state. By opening the fastener 62 of the cover member 60, the cover member 60 can be easily removed / attached.

[0027] The leg support member 40 is a member for supporting the leg member 30, and is made of metal (for example, steel or stainless steel). The leg support member 40 is fixed to the core material 10. The configuration of the leg support member 40 will be described in detail later.

[0028] The leg members 30 are disposed below the core material 10 and transmit the vertical load acting on the core material 10 to the floor surface, and are made of, for example, wood, metal, or resin. In this embodiment, the chair 100 includes four leg members 30 disposed near the four corners of the underside of the core material 10. Each leg member 30 has a main body 31 and a male threaded portion 32 formed on the upper part of the main body 31 (see FIG. 5). Each leg member 30 is supported by the leg support member 40 by threading the male threaded portion 32 into the leg support member 40. Since the leg support member 40 is fixed to the core material 10, each leg member 30 is fixed to the core material 10 via the leg support member 40. The presence of the leg members 30 improves the interior design of the chair 100 and also improves breathability by ensuring a space between the underside of the core material 10 and the floor surface.

[0029] In this embodiment, the horizontal cross-sectional shape of the main body 31 of each leg member 30 is substantially octagonal. The outer diameter of the horizontal cross-section of the main body 31 of each leg member 30 decreases toward the bottom. The height H2 of each leg member 30 is, for example, 90 mm or more and 150 mm or less (more specifically, about 120 mm), the distance W2 along the left-right direction between the two front-located leg members 30 is, for example, 380 mm or more and 480 mm or less (more specifically, about 430 mm), and the distance D2 along the front-rear direction between the two front-rear aligned leg members 30 is, for example, 310 mm or more and 410 mm or less (more specifically, about 360 mm).

[0030] A-2. Detailed configuration of leg support member 40: Fig. 8 is an explanatory diagram showing a detailed configuration of the leg support member 40 in the first embodiment. As shown in Fig. 8, the leg support member 40 has a fixed portion 41, a lower portion 42, and a connecting portion 43 that connects the fixed portion 41 and the lower portion 42.

[0031] The fixing portion 41 of the leg support member 40 is a layered portion extending in a substantially horizontal direction. The fixing portion 41 has a substantially rectangular frame portion 411 with through holes formed therethrough in the vertical direction, and protrusions 412 protruding in the front-rear direction from each corner of the frame portion 411. The frame portion 411 is a portion composed of four rod-shaped portions connected to each other. In this specification, the term "rod-shaped" refers to a shape extending in the longitudinal direction, in which, in a cross section perpendicular to the longitudinal direction, the minimum ratio of the diameter (maximum dimension) along one direction to the diameter along a direction perpendicular to the one direction is 0.2 or greater. As described above, the shape of the seat portion 102 when viewed in the vertical direction is substantially trapezoidal, with the width in the left-right direction increasing toward the front. Accordingly, the shape of the frame portion 411 is also substantially trapezoidal, with the width in the left-right direction increasing toward the front. The width W3 in the left-right direction of the frame portion 411 is, for example, 380 mm or more and 480 mm or less (more specifically, approximately 430 mm) at the front end position (width W3a), and is narrower at the rear end position (width W3b) than at the front end position, for example, 360 mm or more and 460 mm or less (more specifically, approximately 410 mm). The depth D3 in the front-rear direction of the frame portion 411 is, for example, 200 mm or more and 260 mm or less (more specifically, approximately 230 mm). The protrusion length L1 of each protrusion 412 is, for example, 33 mm or more and 53 mm or less (more specifically, approximately 43 mm). The fixing portion 41 is formed, for example, by joining (e.g., welding) tubular materials having rectangular cross sections (e.g., 20 mm wide x 10 mm long x 1.0 mm thick).

[0032] The lower section 42 of the leg support member 40 is a layered section extending substantially horizontally below the fixed section 41. The lower section 42 has a substantially rectangular frame-shaped frame section 421 with through holes formed therethrough in the up-down direction, protruding sections 422 protruding in the front-to-rear direction from each corner of the frame section 421, and diagonal members 424 diagonally connecting the tips of the two protruding sections 422 located on the front side of the frame section 421 to the front side of the frame section 421. The frame section 421 of the lower section 42 has a shape that substantially matches (overlaps) the frame section 411 of the fixed section 41 when viewed in the up-down direction. Of the four protrusions 422, the protrusion length L2a of the two protrusions 422 located on the front side is, for example, 70 mm or more and 90 mm or less (more specifically, about 80 mm), and the protrusion length L2b of the two protrusions 422 located on the rear side is shorter than the protrusion length L2a of the two protrusions 422 located on the front side, for example, 42 mm or more and 62 mm or less (more specifically, about 52 mm). The lower part 42 is formed, for example, by joining (e.g., welding) tubular materials each having a rectangular cross section (e.g., 20 mm wide x 20 mm long x 1.5 mm thick) larger than the rectangular cross section of the tubular material constituting the fixing part 41. The frame part 421 is an example of a main part in the claims.

[0033] A leg attachment portion 423 is provided near the tip of each of the protruding portions 422 of the lower stage portion 42. A female thread is formed on each leg attachment portion 423. As shown in Fig. 5, the male thread portion 32 of each leg member 30 threadably engages with the female thread formed on the leg attachment portion 423 provided on each protruding portion 422, thereby supporting each leg member 30 on the lower stage portion 42 of the leg support member 40. The lower stage portion 42 is formed by joining together tubular materials with a rectangular cross section larger than the rectangular cross section of the tubular material forming the fixing portion 41, and therefore the lower stage portion 42 can stably support each leg member 30.

[0034] The connecting portion 43 of the leg support member 40 is composed of four columnar members that vertically connect each corner of the frame portion 411 of the fixed portion 41 and each corner of the frame portion 421 of the lower portion 42. Each columnar member that makes up the connecting portion 43 is made of, for example, a tubular material with a rectangular cross section (e.g., 20 mm left-right, 10 mm front-back, and 1.0 mm thick) that is smaller than the rectangular cross section of the tubular material that makes up the lower portion 42. The connecting portion 43, the fixed portion 41, and the lower portion 42 are joined together, for example, by welding. The height H3 of the connecting portion 43 (i.e., the distance between the fixed portion 41 and the lower portion 42) is, for example, 40 mm or more and 60 mm or less (more specifically, approximately 50 mm).

[0035] As shown in FIG. 5, the leg support member 40 is embedded inside the core material 10. However, the underside of the lower portion 42 of the leg support member 40 is exposed from the underside of the core material 10. Furthermore, there are substantially no cavities inside the core material 10, and each portion of the leg support member 40 is surrounded by the material that constitutes the core material 10. In other words, the surface of each portion of the leg support member 40 (except the underside of the lower portion 42) is in contact with the inner surface of the core material 10. Because the leg support member 40 is configured in this manner, the fixing portion 41 of the leg support member 40 is sandwiched from above and below by the core material 10 (the material that constitutes the core material 10) inside the core material 10. Note that in this embodiment, the fixing portion 41 of the leg support member 40 is also sandwiched from the left and right inside the core material 10 by the core material 10. Furthermore, the position of the leg support member 40 inside the core material 10 can be set arbitrarily, but in this embodiment, the leg support member 40 is located in a relatively lower part of the core material 10, more specifically, it is located below half the height of the core material 10.

[0036] The above-described configuration in which the leg support member 40 is embedded inside the core material 10 can be realized by, for example, insert molding. That is, the leg support member 40 is attached in advance to a mold, the mold is closed, and resin is injected and molded to manufacture the core material 10 as a foamed resin body integrated with the leg support member 40, thereby achieving the above-described configuration.

[0037] A-3. Advantages of this embodiment: As described above, the chair 100 of this embodiment is a chair having a seat portion 102, and comprises a core material 10, a leg support member 40, and four leg members 30. The core material 10 is formed from a foamed resin body and constitutes at least a part of the seat portion 102. The leg support member 40 is fixed to the core material 10. Each leg member 30 is supported by the leg support member 40. The leg support member 40 has fixing parts 41 that are sandwiched from above and below by the core material 10 inside the core material 10.

[0038] As described above, in the chair 100 of this embodiment, the leg support members 40 that support each leg member 30 have fixing portions 41 that are sandwiched between the core material 10 and the core material 10 from above and below. Therefore, the chair 100 of this embodiment can prevent misalignment between the core material 10 and the leg support members 40 when stress is generated in the core material 10 and the leg support members 40 due to a person sitting on the chair. Therefore, the chair 100 of this embodiment can prevent the leg support members 40 from peeling off and falling off the core material 10 due to such misalignment, or prevent internal peeling from occurring near the interface between the core material 10 and the leg support members 40, which would damage the core material 10. As a result, the durability of the chair 100 can be improved.

[0039] Furthermore, in chair 100 of this embodiment, fixed portion 41 of leg support member 40 has frame portion 411 with through-holes formed therein that penetrate in the up-down direction. Therefore, according to chair 100 of this embodiment, the presence of fixed portion 41 improves the durability of chair 100, while suppressing an increase in the weight of fixed portion 41 compared to a configuration in which fixed portion 41 has a flat plate-shaped portion, thereby suppressing an increase in the weight of chair 100.

[0040] Furthermore, in the chair 100 of this embodiment, the leg support member 40 further has a lower step portion 42 and a connecting portion 43. The lower step portion 42 is disposed below the fixed portion 41, with its underside exposed from the underside of the core material 10, and supports each leg member 30. The connecting portion 43 connects the fixed portion 41 and the lower step portion 42. Therefore, according to the chair 100 of this embodiment, the presence of the fixed portion 41 improves the durability of the chair 100, and the presence of the lower step portion 42, the underside of which is exposed from the underside of the core material 10, makes it possible for the leg support member 40 to easily support each leg member 30 regardless of the shape of the core material 10.

[0041] Furthermore, in the chair 100 of this embodiment, the lower stage 42 of the leg support member 40 has a frame portion 421 with through holes formed therein that penetrate in the vertical direction. Therefore, according to the chair 100 of this embodiment, the presence of the lower stage 42 makes it easy to achieve support of each leg member 30 by the leg support member 40, while suppressing an increase in the weight of the lower stage 42 compared to a configuration in which the lower stage 42 has a flat plate-shaped portion, and therefore suppressing an increase in the weight of the chair 100.

[0042] Furthermore, in chair 100 of this embodiment, lower section 42 of leg support member 40 has frame section 421 and protruding section 422 that protrudes from frame section 421 in a substantially horizontal direction, and each leg member 30 is supported by protruding section 422. Therefore, according to chair 100 of this embodiment, the load that is transmitted downward from seat surface 103 due to a person sitting can be transmitted to each leg member 30 via a wider area of ​​leg support member 40 and core material 10, thereby effectively dispersing the load and effectively improving the durability of chair 100.

[0043] Furthermore, in the chair 100 of this embodiment, the leg support member 40 is made of metal. Therefore, according to the chair 100 of this embodiment, the strength of the leg support member 40 itself can be increased to a certain level or more, and deformation and breakage of the leg support member 40 can be suppressed. As a result, the durability of the chair 100 can be effectively improved.

[0044] B. Second embodiment: 9 is an explanatory diagram conceptually showing the configuration of the leg support member 40a in the second embodiment. In the following, among the configuration of the leg support member 40a in the second embodiment, the same configuration as the leg support member 40 in the first embodiment described above will be denoted by the same reference numerals and the description thereof will be omitted as appropriate.

[0045] The leg support member 40a of the second embodiment differs from the leg support member 40 of the first embodiment in that the fixing portion 41 has a mesh portion 413. The mesh portion 413 is a mesh-like portion having a large number of through-holes that penetrate in the vertical direction. The mesh portion 413 has a configuration in which, for example, substantially cylindrical members with a diameter of about 3 mm are arranged in a grid pattern at a pitch of about 20 mm in the front-rear and left-right directions and joined together. The outer shape of the mesh portion 413 when viewed in the vertical direction is substantially the same as the outer shape of the frame portion 411. The mesh portion 413 is joined (for example, welded) to the frame portion 411 along its outer periphery.

[0046] Similar to the leg support member 40 of the first embodiment, the leg support member 40a of the second embodiment is embedded inside the core material 10 with the lower surface of the lower section 42 exposed from the lower surface of the core material 10 (see FIG. 5). At this time, the material that constitutes the core material 10 is also present in the mesh-like spaces in the mesh section 413 of the fixing part 41 of the leg support member 40a. This configuration can be achieved, for example, by insert molding.

[0047] As described above, in the leg support member 40a constituting the chair 100 of the second embodiment, the fixing portion 41 has a mesh portion 413 having a large number of through-holes that penetrate in the vertical direction. Therefore, according to the second embodiment, it is possible to increase the contact area between the fixing portion 41 of the leg support member 40a and the core material 10 while suppressing an increase in the weight of the leg support member 40a and, ultimately, the weight of the chair 100. The presence of the fixing portion 41 effectively suppresses the occurrence of misalignment between the core material 10 and the leg support member 40a. Therefore, according to the second embodiment, it is possible to effectively suppress the leg support member 40a from peeling and falling off the core material 10 due to the misalignment, or to suppress internal peeling near the interface between the core material 10 and the leg support member 40a, which would cause damage to the core material, thereby effectively improving the durability of the chair 100.

[0048] C. Third embodiment: 10 is an explanatory diagram conceptually showing the configuration of the leg support member 40b in the third embodiment. In the following, among the configuration of the leg support member 40b in the third embodiment, the same configuration as the leg support member 40 in the first embodiment described above will be denoted by the same reference numerals and the description thereof will be omitted as appropriate.

[0049] The leg support member 40b of the third embodiment differs from the leg support member 40 of the first embodiment in that the fixing portion 41 has a flat plate-shaped portion 414. The flat plate-shaped portion 414 is a substantially flat portion that is substantially perpendicular to the up-down direction. The flat plate-shaped portion 414 is, for example, a metal plate with a thickness of approximately 1 mm. In this embodiment, the width of the flat plate-shaped portion 414 in the left-right direction is substantially the same as the width of the frame portion 411, while the depth of the flat plate-shaped portion 414 in the front-rear direction is shorter than the depth of the frame portion 411. The flat plate-shaped portion 414 is joined (for example, welded) to the frame portion 411 along its left-right edge. The flat plate-shaped portion 414 covers a portion of the through-hole of the frame portion 411 near the substantially center in the front-rear direction.

[0050] Furthermore, in the leg support member 40b of the third embodiment, the depth of the frame portion 411 of the fixed portion 41 is approximately the same as the depth of the frame portion 421 of the lower portion 42, but the width of the frame portion 411 of the fixed portion 41 is shorter than the width of the frame portion 421 of the lower portion 42. In other words, when viewed in the vertical direction, the frame portion 421 of the lower portion 42 has a shape that protrudes to the right and left compared to the frame portion 411 of the fixed portion 41. As a result, when viewed in the vertical direction, the second region R2 defined by the outline of the lower portion 42 includes the first region R1 defined by the outline of the fixed portion 41 and has a larger area than the first region R1.

[0051] Similar to the leg support member 40 of the first embodiment, the leg support member 40b of the third embodiment is embedded inside the core material 10 with the lower surface of the lower section 42 exposed from the lower surface of the core material 10 (see FIG. 5). At this time, the upper and lower surfaces of the flat plate-shaped section 414 of the fixing section 41 of the leg support member 40b are also in contact with the material that constitutes the core material 10. This configuration can be achieved, for example, by insert molding.

[0052] As described above, in the leg support member 40b constituting the chair 100 of the third embodiment, the fixing portion 41 has a substantially flat plate-like portion 414 that is substantially perpendicular to the up-down direction. Therefore, according to the third embodiment, the contact area between the fixing portion 41 of the leg support member 40b and the core material 10 can be increased, and the presence of the fixing portion 41 can effectively suppress the occurrence of misalignment between the core material 10 and the leg support member 40b. Therefore, according to the third embodiment, it is possible to effectively suppress the leg support member 40b from peeling and falling off from the core material 10 due to such misalignment, or the occurrence of internal peeling near the interface between the core material 10 and the leg support member 40b, which would cause damage to the core material, and the durability of the chair 10 can be effectively improved.

[0053] Furthermore, in the leg support member 40b constituting the chair 100 of the third embodiment, when viewed in the vertical direction, the second region R2 defined by the outline of the lower portion 42 encompasses the first region R1 defined by the outline of the fixing portion 41 and has a larger area than the first region R1. Therefore, according to the third embodiment, the load transmitted downward from the seat surface 103 due to a person sitting can be transmitted to each leg member 30 via a wider area of ​​the leg support member 40b and the core material 10, thereby effectively dispersing the load and effectively improving the durability of the chair 100.

[0054] In addition, in the leg support member 40b constituting the chair 100 of the third embodiment, the flat portion 414 covers a portion of the through hole of the frame portion 411 approximately in the center in the front-to-back direction. Therefore, compared to a configuration in which the flat portion 414 covers the entire through hole of the frame portion 411, the presence of the flat portion 414 effectively suppresses the occurrence of misalignment between the core material 10 and the leg support member 40b, while suppressing an increase in the weight of the leg support member 40b and, ultimately, the weight of the chair 100.

[0055] D. Variations: The technology disclosed in this specification is not limited to the above-described embodiments, and can be modified into various forms without departing from the spirit thereof, for example, the following modifications are also possible.

[0056] The configuration of the chair 100 in the above embodiment is merely an example and can be modified in various ways. For example, the shape and dimensions of each part of the chair 100 in the above embodiment, the forming materials, and the manufacturing method are merely an example and can be modified in various ways. Also, in the above embodiment, the chair 100 includes a seat 102 and a back 104, but the chair 100 does not have to include a back 104. Also, in the above embodiment, the chair 100 includes a cushioning material 20 and a cover member 60, but at least one of these may be omitted.

[0057] In the above embodiment, the leg support member 40 has the fixed portion 41, the lower portion 42, and the connecting portion 43. However, the leg support member 40 does not necessarily have to have the lower portion 42 and the connecting portion 43. In this case, each leg member 30 is supported by the fixed portion 41 of the leg support member 40. Also, in the above embodiment, the fixed portion 41 of the leg support member 40 has the frame portion 411, but the fixed portion 41 does not necessarily have to have the frame portion 411. For example, the fixed portion 41 may be composed of only a flat plate-shaped portion that is approximately perpendicular to the vertical direction. Also, the fixed portion 41 may have a portion other than the frame portion 411 that is composed of a plurality of rod-shaped portions connected to each other (for example, an H-shaped portion when viewed in the vertical direction). Similarly, in the above embodiment, the lower portion 42 of the leg support member 40 has the frame portion 421, but the lower portion 42 does not necessarily have to have the frame portion 421. In addition, in the above embodiment, the lower portion 42 of the leg support member 40 has the protrusion 422 and the leg member 30 is supported by the protrusion 422, but the leg member 30 may also be supported by the frame portion 421.

[0058] In the above embodiment, the fixing portion 41 of the leg support member 40 is sandwiched by the core material 10 from above, below, left and right inside the core material 10, but while the fixing portion 41 is sandwiched by the core material 10 from above and below, it is also possible that it is not sandwiched by the core material 10 from left and right. For example, in the above first embodiment, the layered space surrounded by the frame portion 411 of the fixing portion 41 may not be filled with the material that makes up the core material 10, and as a result, the fixing portion 41 may not be sandwiched by the core material 10 from left and right.

[0059] In the above embodiment, the chair 100 includes four leg members 30, but the number of leg members 30 included in the chair 100 may be three or less, or five or more. For example, the chair 100 may include only one leg member 30, and in that case, the chair 100 may be configured to be rotatable horizontally around the axis of the one leg member 30. [Explanation of symbols]

[0060] 10: Core material 20: Cushion material 21: Lower cushion material 22: Upper cushion material 30: Leg member 31: Main body 32: Male thread portion 40: Leg support member 41: Upper portion 42: Lower portion 43: Connecting portion 60: Cover member 62: Fastener 100: Chair 102: Seat 103: Seat surface 104: Back 105: Backrest surface 411: Frame portion 412: Protruding portion 413: Mesh portion 414: Flat portion 421: Frame portion 422: Protruding portion 423: Leg attachment portion 424: Diagonal member

Claims

1. A chair having a seat, a core material formed of a foamed resin body and constituting at least a part of the seat portion; a leg support member fixed to the core material; at least one leg member supported by the leg support member; Equipped with The leg support member has a fixed portion sandwiched by the core material from above and below inside a portion of the core material that forms the seat portion; a lower stage portion disposed below the fixing portion and supporting the leg member; a connecting portion that connects the fixed portion and the lower portion; and When viewed in the up-down direction, a second region defined by the outline of the lower portion of the leg support member includes a first region defined by the outline of the fixing portion of the leg support member and has an area larger than that of the first region. chair.

2. A chair having a seat, a core material formed of a foamed resin body and constituting at least a part of the seat portion; a leg support member fixed to the core material; at least one leg member supported by the leg support member; Equipped with The leg support member has a fixed portion sandwiched by the core material from above and below inside a portion of the core material that forms the seat portion; a lower stage portion disposed below the fixing portion and supporting the leg member; a connecting portion that connects the fixed portion and the lower portion; and the lower portion of the leg support member has a main portion and a protruding portion protruding from the main portion in a substantially horizontal direction, The leg member is supported by the protrusion. chair.

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