JP2023050232A - Chair - Google Patents

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

The technology disclosed in this specification relates to chairs.

In order to reduce the weight of the chair and improve the flexibility of its shape, a foamed resin body such as polystyrene foam is sometimes used as the core material of the chair. Further, in some chairs, leg members are provided in order to improve the interior design and to secure a space between the core material and the floor surface to improve breathability. Conventionally, there has been known a chair having a configuration in which a plate member is adhered to the lower surface of a core member made of foamed resin, and leg members are fixed to the plate member (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2003-102583

In general, a foamed resin body does not have good adhesiveness with other materials, and is a material that tends to peel off inside. Therefore, in a chair having a configuration in which a plate is adhered to the lower surface of the core made of the foamed resin body, and leg members are fixed to the plate, stress is applied to the core and the plate due to the seating of a person. When this occurs, vertical and/or horizontal misalignment occurs between the core material and the plate material, causing the plate material to separate from the core material and fall off, or internal detachment to occur near the interface between the core material and the plate material. It may occur and damage the core material. As described above, conventionally, there is a problem that it is difficult to impart sufficient durability to a chair provided with a core material formed of a foamed resin body and leg members.

This specification discloses a technology capable of solving the above-described problems.

The technology disclosed in this specification can be implemented, for example, in the following forms.

(1) A chair disclosed in this specification is a chair having a seat, comprising a core, a leg support member, and at least one leg member. The core material is made of foamed resin, and constitutes at least part of the seat. The leg support member is fixed to the core. The leg member is supported by the leg support member. The leg support member has a fixed portion sandwiched by the core material from above and below inside the core material.

Thus, in this chair, the leg support member that supports the leg member has a fixed portion sandwiched by the core material from above and below. Therefore, according to this chair, when stress is generated in the core material and the leg support member due to the seating of a person, the presence of the fixed part allows vertical and/or horizontal movement between the core material and the leg support member. It is possible to suppress the occurrence of direction deviation. Therefore, according to this chair, the leg support member peels off from the core material due to the displacement, and the core material is damaged due to internal peeling occurring near the interface between the core material and the leg support member. It is possible to suppress the wear and tear, and as a result, it is possible to improve the durability of the chair.

(2) In the above chair, the fixed portion of the leg support member may have a portion composed of a plurality of rod-like portions connected to each other. According to this configuration, the durability of the chair is improved due to the presence of the fixing portion, and an increase in the weight of the fixing portion can be suppressed compared to a configuration in which the fixing portion has a flat portion, which in turn contributes to the weight of the chair. increase can be suppressed.

(3) In the above chair, the portion composed of the plurality of rod-like portions connected to each other may be a frame-like portion having a through hole penetrating therethrough in the vertical direction. According to this configuration, the presence of the frame-shaped portion of the fixing portion effectively improves the durability of the chair, while suppressing an increase in the weight of the fixing portion compared to a configuration in which the fixing portion has a flat plate-like portion. It is possible to suppress an increase in the weight of the chair.

(4) In the above chair, the fixed portion of the leg support member may have a substantially flat plate-like portion substantially perpendicular to the vertical direction. According to this configuration, the contact area between the fixed portion of the leg support member and the core member can be increased, and the presence of the fixed portion effectively suppresses the occurrence of displacement between the core member and the leg support member. be able to. Therefore, according to this configuration, the leg support member peels off and falls off from the core material due to the displacement, or the core material is damaged due to internal peeling occurring near the interface between the core material and the leg support member. Therefore, it is possible to effectively suppress the slippage and effectively improve the durability of the chair.

(5) In the above chair, the fixed portion of the leg support member may have a net-like portion formed with a large number of through-holes penetrating in the vertical direction. According to this configuration, it is possible to increase the contact area between the fixed portion of the leg support member and the core material while suppressing an increase in the weight of the leg support member and, in turn, an increase in the weight of the chair. and the leg support member can be effectively suppressed from occurring. Therefore, according to this configuration, the leg support member peels off and falls off from the core material due to the displacement, or the core material is damaged due to internal peeling occurring near the interface between the core material and the leg support member. Therefore, it is possible to effectively suppress the slippage and effectively improve the durability of the chair.

(6) In the above chair, the leg support member may be a lower section arranged below the fixing section, the lower surface of which is exposed from the lower surface of the core member, and which supports the leg member. and a connecting portion connecting the fixing portion and the lower portion. According to this configuration, the durability of the chair is improved by the presence of the fixed part, and the leg members are supported by the leg support member regardless of the shape of the core material due to the presence of the lower part whose lower surface is exposed from the lower surface of the core material. can be easily realized.

(7) In the above chair, the lower portion of the leg support member may have a frame-shaped portion having a through hole penetrating therethrough in the vertical direction. According to this configuration, the presence of the lower portion facilitates the support of the leg members by the leg support member, while suppressing an increase in the weight of the lower portion compared to a configuration in which the lower portion has a flat portion. It is possible to suppress an increase in the weight of the chair.

(8) In the above chair, when viewed in the vertical direction, the second area defined by the outline of the lower portion of the leg support member is the first region defined by the outline of the fixing portion of the leg support member. and having a larger area than the first region. According to this configuration, the load transmitted downward from the seat surface due to the seating of a person can be effectively dispersed by transmitting the load to the leg members via a wider range of the leg support members and the core member. It can effectively improve the durability of the chair.

(9) In the above chair, the lower portion of the leg support member has a main portion and a projecting portion projecting substantially horizontally from the main portion, and the leg member is supported by the projecting portion. It is also possible to adopt a configuration in which According to this configuration, the load transmitted downward from the seat surface due to the seating of a person can be effectively dispersed by transmitting the load to the leg members via a wider range of the leg support members and the core member. It can effectively improve the durability of the chair.

The technology disclosed in this specification can be implemented in various forms, for example, in the form of a chair and its manufacturing method.

Explanatory drawing which shows roughly the structure of the chair 100 in 1st Embodiment Explanatory drawing which shows roughly the structure of the chair 100 in 1st Embodiment Explanatory drawing which shows roughly the structure of the chair 100 in 1st Embodiment Explanatory drawing which shows roughly the structure of the chair 100 in 1st Embodiment Explanatory drawing which shows roughly the structure of the chair 100 in 1st Embodiment Explanatory drawing which shows roughly the structure of the chair 100 in 1st Embodiment Explanatory drawing which shows roughly the structure of the chair 100 in 1st Embodiment Explanatory drawing showing the detailed configuration of the leg support member 40 in the first embodiment. Explanatory drawing conceptually showing the configuration of the leg support member 40a in the second embodiment. Explanatory drawing conceptually showing the configuration of the leg support member 40b in the third embodiment.

A. First embodiment:
A-1. Configuration of chair 100:
1 to 7 are explanatory diagrams schematically showing the configuration of the chair 100 according to the first embodiment. 1 shows the front configuration of the chair 100, FIG. 2 shows the side configuration of the chair 100, FIG. 3 shows the top configuration of the chair 100, and FIG. 5 shows the YZ cross-sectional configuration of chair 100 at position VV in FIG. 1, and FIG. 6 shows the XZ cross-sectional configuration of chair 100 at position VI-VI in FIG. 7 shows the external configuration of each member constituting the chair 100. As shown in FIG. Each figure shows mutually orthogonal XYZ axes for specifying directions. The positive Z-axis direction is upward, the negative Z-axis direction is downward, the positive Y-axis direction is forward, and the negative Y-axis direction is backward. Also, the X-axis direction is the horizontal direction.

The chair 100 is a so-called sofa-type chair for one person, and is installed and used in, for example, homes, offices, shops, hotels, public facilities, and the like. The height H1 of the chair 100 is, for example, 700 mm or more and 800 mm or less (more specifically, about 750 mm), and the horizontal width W1 of the chair 100 is, for example, 530 mm or more and 630 mm or less (more specifically, about 580 mm). ), and the depth D1 of the chair 100 in the front-rear direction is, for example, 500 mm or more and 600 mm or less (more specifically, about 550 mm).

Chair 100 includes a seat portion 102 and a back portion 104 . The seat portion 102 has a seat surface 103 and is a portion that mainly supports the buttocks of the seated person. The seat surface 103 is inclined so as to gradually decrease from the front to the rear (see FIG. 5). This prevents the pelvis of the seated person from slipping forward, and makes it easier for the seated person to lean against the back 104 . The height of the front end of the seat surface 103 from the floor is set to, for example, 380 mm or more and 480 mm or less (more specifically, about 430 mm) so that the feet of the seated person can easily reach the floor. Further, the height of the rear end of the seat surface 103 from the floor surface is lower than the front end of the seat surface 103, and is set to, for example, 350 mm or more and 450 mm or less (more specifically, about 400 mm). In addition, the front surface of the seat portion 102 is curved rearward so that the central portion is recessed (see FIG. 3). Thereby, the leg of the seated person can be accommodated in the recessed portion, and the burden on the knees of the seated person can be reduced. Also, the shape of the seat portion 102 when viewed in the up-down direction is substantially trapezoidal so that the left-right width becomes wider toward the front.

The back portion 104 has a backrest surface 105 and is a 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 has a shape such that the vicinity of the left and right ends protrudes forward (see FIG. 3). As a result, the backrest surface 105 has a substantially U-shape, which prevents the seated person from being displaced in the left-right direction, and allows the user to place his or her hands on the seat to facilitate the rising motion. The angle between the backrest surface 105 and the seat surface 103 is set to about 80 degrees. As a result, body pressure can be effectively dispersed between the backrest surface 105 and the seat surface 103 . The angle formed by the backrest surface 105 and the seat surface 103 is 10 cm along the backrest surface 105 from point A, where the boundary between the backrest surface 105 and the seat surface 103 is the center position of the chair 100 in the left-right direction. A tangent to the backrest surface 105 at a point X1 and a tangent to the seat surface 103 at a point X2, when a position away from the seat surface 103 is a point X1 and a position 12 cm away from the point A along the seat surface 103 is a point X2. Measured as an angle to make.

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

The core material 10 is a member that functions as a core that roughly defines the shape of the seat portion 102 and the back portion 104, and is made of foamed resin. A foamed resin body is a porous body formed into a foamed shape by finely dispersing gas in a resin. As the foamed resin body for forming the core material 10, for example, foamed polystyrene or foamed urethane can be used. In this embodiment, foamed polystyrene is used as the foamed resin body for forming the core material 10 . By forming the core material 10 from a foamed resin body, it is possible to reduce the weight of the core material 10 (and thus the chair 100) and improve the degree of freedom in shape. A lower surface (bottom surface) of the core material 10 is substantially horizontal and planar.

The cushion material 20 is a member that is arranged on a surface of the core material 10 corresponding to the seat surface 103 and the backrest surface 105 and softens the area around the seat surface 103 and the backrest surface 105 . In this embodiment, the cushioning material 20 is composed of a lower cushioning material 21 and an upper cushioning material 22 (see FIG. 7). The lower cushion material 21 is arranged on the surface of the core material 10 corresponding to the seat surface 103, and is made of chip urethane, for example. The upper cushion material 22 is arranged 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.

The cover member 60 is a member that is put on the structure composed of the core material 10 and the cushion material 20 to cover the surface of the structure, and is made of cloth, for example. Due to the existence of the cover member 60, it is possible to prevent the core material 10 and the cushion material 20 from being soiled, and to provide the seat surface 103 and the backrest surface 105 with a cool or warm feeling. The cover member 60 may cover the entire surface of the structure, or may cover the structure such that a part of the surface (for example, part of the lower surface) of the structure is exposed. A fastener 62 is provided on the back surface of the cover member 60 . The fastener 62 is closed when the cover member 60 is attached. By opening the fastener 62 of the cover member 60, the cover member 60 can be easily removed/attached.

The leg support member 40 is a member for supporting the leg member 30, and is made of metal (for example, steel, stainless steel, etc.). The leg support member 40 is fixed to the core member 10 . The configuration of the leg support member 40 will be detailed later.

The leg member 30 is arranged below the core member 10 and is a member that transmits a vertical load acting on the core member 10 to the floor surface, and is made of wood, metal, resin, or the like, for example. In this embodiment, the chair 100 has four leg members 30 arranged near the four corners of the lower surface of the core member 10 . Each leg member 30 has a main body portion 31 and a male screw portion 32 formed on the upper portion of the main body portion 31 (see FIG. 5). Each leg member 30 is supported by the leg support member 40 by screwing the male screw portion 32 into the leg support member 40 . Since the leg support members 40 are fixed to the core member 10 , each leg member 30 is fixed to the core member 10 via the leg support members 40 . Due to the presence of the leg members 30, the interior design of the chair 100 is improved, and a space is secured between the lower surface of the core member 10 and the floor surface to improve ventilation.

In this embodiment, the horizontal cross-sectional shape of the main body portion 31 of each leg member 30 is substantially octagonal. In addition, the outer diameter of the horizontal cross section of the main body portion 31 of each leg member 30 decreases downward. 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). Above, it is 480 mm or less (more specifically, about 430 mm), and the distance D2 along the front-rear direction between the two leg members 30 aligned in the front-rear direction is, for example, 310 mm or more and 410 mm or less (more specifically, about 360 mm). is.

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

The fixed portion 41 of the leg support member 40 is a layered portion extending substantially horizontally. The fixed portion 41 has a substantially rectangular frame-shaped frame portion 411 in which a through hole penetrating in the vertical direction is formed, and protruding portions 412 that protrude in the front-rear direction from the respective corners 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, and in a cross section perpendicular to the longitudinal direction, the diameter (maximum dimension) along one direction It means a shape in which the minimum value of the diameter ratio is 0.2 or more. As described above, the shape of the seat portion 102 in the vertical direction is a substantially trapezoidal shape in which the width in the horizontal direction increases toward the front. It has a substantially trapezoidal shape with a wider width. The width W3 of the frame portion 411 in the left-right direction is, for example, 380 mm or more and 480 mm or less (more specifically, about 430 mm) at the front end position (width W3a), and is 380 mm or more and 480 mm or less (more specifically, about 430 mm) at the rear end position (width W3b). It is narrower than the position, for example, 360 mm or more and 460 mm or less (more specifically, about 410 mm). Further, the depth D3 of the frame portion 411 in the front-rear direction is, for example, 200 mm or more and 260 mm or less (more specifically, about 230 mm). Also, the protruding length L1 of each protruding portion 412 is, for example, 33 mm or more and 53 mm or less (more specifically, about 43 mm). The fixed portion 41 is formed by, for example, joining (for example, welding) tubular materials each having a rectangular cross section (for example, 20 mm wide×10 mm long×1.0 mm thick).

The lower part 42 of the leg support member 40 is a layered part extending substantially horizontally below the fixed part 41 . The lower stage portion 42 includes a substantially rectangular frame-shaped frame portion 421 in which a through hole penetrating in the vertical direction is formed, projecting portions 422 projecting in the front-rear direction from respective corners of the frame portion 421, and four projecting portions 422. A diagonal member 424 obliquely connects the tip portions of the two projecting portions 422 located on the front side and the front side of the frame portion 421 . The frame portion 421 of the lower stage portion 42 has a shape that substantially matches (overlaps) the frame portion 411 of the fixed portion 41 when viewed in the vertical direction. Further, of the four protrusions 422, the protrusion length L2a of the two protrusions 422 positioned on the front side is, for example, 70 mm or more and 90 mm or less (more specifically, about 80 mm), and the two protrusions 422 positioned on the rear side The protrusion length L2b of the protrusion 422 is shorter than the protrusion length L2a of the two protrusions 422 located on the front side, and is, for example, 42 mm or more and 62 mm or less (more specifically, about 52 mm). The lower part 42 is formed by joining (for example, welding) tubular materials having a rectangular cross section (for example, 20 mm wide×20 mm long×1.5 mm thick) larger than the rectangular cross section of the tubular material constituting the fixed part 41 . It is composed of The frame part 421 is an example of the main part in the claims.

A leg attachment portion 423 is provided near the tip of each projecting portion 422 of the lower portion 42 . A female screw is formed in each leg attachment portion 423 . As shown in FIG. 5, the male screw portion 32 of each leg member 30 is screwed into the female screw formed in the leg mounting portion 423 provided in each projecting portion 422 so that each leg member 30 can support the leg. It is supported by the lower part 42 of the member 40 . Since the lower part 42 is formed by joining together tubular materials having a rectangular cross section larger than that of the tubular material constituting the fixing part 41, the lower part 42 stably supports each leg member 30. be able to.

The connecting portion 43 of the leg support member 40 is composed of four columnar members vertically connecting each corner of the frame portion 411 of the fixed portion 41 and each corner of the frame portion 421 of the lower step portion 42 . Each columnar member constituting the connecting part 43 is made of a tubular material having a rectangular cross section smaller than that of the tubular material constituting the lower part 42 (for example, 20 mm in the horizontal direction, 10 mm in the front-rear direction, and 1.0 mm in thickness). It is The connecting portion 43, the fixed portion 41 and the lower portion 42 are joined by welding, for example. A height H3 of the connecting portion 43 (that is, the distance between the fixing portion 41 and the lower portion 42) is, for example, 40 mm or more and 60 mm or less (more specifically, about 50 mm).

As shown in FIG. 5 , the leg support member 40 is embedded inside the core member 10 . However, the lower surface of the lower portion 42 of the leg support member 40 is exposed from the lower surface of the core member 10 . Further, substantially no cavities exist inside the core 10 , and each part of the leg support member 40 is surrounded by the material forming the core 10 . That is, the surface of each part of the leg support member 40 (except the lower surface of the lower part 42) is in contact with the inner surface of the core member 10. As shown in FIG. Since the leg support member 40 is configured as described above, the fixed portion 41 of the leg support member 40 is sandwiched by the core member 10 (the material forming the core member 10 ) from above and below inside the core member 10 . In this embodiment, the fixing portion 41 of the leg support member 40 is sandwiched by the core member 10 inside the core member 10 from both sides. In addition, the position of the leg support member 40 inside the core material 10 can be set arbitrarily, but in the present embodiment, the leg support member 40 is positioned at a relatively lower portion of the core material 10, More specifically, it is located below the half position along the height direction of the core material 10 .

The structure in which the leg support member 40 is embedded inside the core member 10 can be realized by, for example, insert molding. That is, the core material 10 as a foamed resin body integrated with the leg support member 40 is manufactured by mounting the leg support member 40 in advance in the mold, closing the mold, and injecting and molding the resin. The configuration described above can be realized.

A-3. Effect of this embodiment:
As described above, the chair 100 of this embodiment is a chair having a seat portion 102 and includes a core member 10 , leg support members 40 and four leg members 30 . The core material 10 is made of foamed resin and constitutes at least part of the seat portion 102 . The leg support member 40 is fixed to the core member 10 . Each leg member 30 is supported by a leg support member 40 . The leg support member 40 has a fixing portion 41 sandwiched by the core material 10 from above and below inside the core material 10 .

As described above, in the chair 100 of the present embodiment, the leg support member 40 that supports each leg member 30 has the fixed portion 41 sandwiched by the core member 10 from above and below. Therefore, according to the chair 100 of the present embodiment, when stress is generated in the core material 10 and the leg support member 40 due to the seating of a person, the core material 10 and the leg support member 40 are displaced. can be suppressed. Therefore, according to the chair 100 of the present embodiment, the leg support member 40 may be peeled off from the core 10 due to the misalignment, and internal peeling may occur near the interface between the core 10 and the leg support member 40. It is possible to suppress the occurrence of damage to the core material 10, and as a result, the durability of the chair 100 can be improved.

In addition, in the chair 100 of the present embodiment, the fixing portion 41 of the leg support member 40 has a frame portion 411 formed with a through hole penetrating vertically. Therefore, according to the chair 100 of the present embodiment, the durability of the chair 100 is improved due to the presence of the fixing portion 41, and the weight of the fixing portion 41 is reduced compared to the configuration in which the fixing portion 41 has a flat plate portion. Therefore, the weight increase of the chair 100 can be suppressed.

Further, in the chair 100 of the present embodiment, the leg support member 40 further has a lower section 42 and a connecting section 43 . The lower part 42 is arranged below the fixing part 41 , has a lower surface exposed from the lower surface of the core member 10 , and supports each leg member 30 . The connecting portion 43 connects the fixed portion 41 and the lower portion 42 . Therefore, according to the chair 100 of the present embodiment, the durability of the chair 100 is improved by the existence of the fixed part 41, and the shape of the core material 10 is improved by the existence of the lower part 42 whose lower surface is exposed from the lower surface of the core material 10. Regardless, the support of each leg member 30 by the leg support member 40 can be easily realized.

In addition, in the chair 100 of the present embodiment, the lower portion 42 of the leg support member 40 has a frame portion 421 formed with a through hole penetrating vertically. Therefore, according to the chair 100 of this embodiment, the presence of the lower portion 42 facilitates the support of the leg members 30 by the leg support member 40, while the lower portion 42 has a flat plate-like portion. As a result, an increase in weight of the lower section 42 can be suppressed, and an increase in weight of the chair 100 can be suppressed.

In addition, in the chair 100 of this embodiment, the lower part 42 of the leg support member 40 has a frame part 421 and a projecting part 422 projecting substantially horizontally from the frame part 421, and each leg member 30 has a projecting part 422. Therefore, according to the chair 100 of this embodiment, the load transmitted downward from the seat surface 103 due to the seating of a person is transmitted to each leg member 30 via a wider range of the leg support member 40 and the core member 10. Accordingly, the load can be effectively distributed, and the durability of the chair 100 can be effectively improved.

Further, in the chair 100 of the present embodiment, the leg support member 40 is made of metal. Therefore, according to the chair 100 of the present 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. can effectively improve sexuality.

B. Second embodiment:
FIG. 9 is an explanatory diagram conceptually showing the configuration of the leg support member 40a in the second embodiment. Below, among the configurations of the leg support member 40a of the second embodiment, the same configurations as those of the leg support member 40 of the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

The leg support member 40a of the second embodiment differs from the leg support member 40 of the first embodiment in that the fixed portion 41 has a mesh portion 413. As shown in FIG. The net-like portion 413 is a net-like portion formed with a large number of through holes penetrating vertically. The mesh portion 413 has, for example, a configuration in which substantially cylindrical members having a diameter of about 3 mm are arranged in a grid pattern at a pitch of about 20 mm in the front-rear direction and the left-right direction and joined to each other. The outer shape of the net-like portion 413 as 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 peripheral line.

Like the leg support member 40 of the first embodiment, the leg support member 40a of the second embodiment is embedded inside the core member 10 with the lower surface of the lower step portion 42 exposed from the lower surface of the core member 10. (See Figure 5). At this time, the material constituting the core material 10 also exists in the mesh-like space in the net-like portion 413 of the fixing portion 41 of the leg support member 40a. Such a configuration can be realized by insert molding, for example.

As described above, in the leg support member 40a that constitutes the chair 100 of the second embodiment, the fixing portion 41 has the net-like portion 413 formed with a large number of vertically penetrating through holes. 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 member 10 while suppressing the weight increase of the leg support member 40a and, in turn, the weight increase of the chair 100. The presence of the fixing portion 41 can effectively suppress the occurrence of displacement between the core member 10 and the leg support member 40a. Therefore, according to the second embodiment, the leg support member 40a peels off from the core member 10 due to the misalignment, and internal separation occurs near the interface between the core member 10 and the leg support member 40a. Therefore, it is possible to effectively prevent the core material from being damaged by squeezing, and the durability of the chair 100 can be effectively improved.

C. Third embodiment:
FIG. 10 is an explanatory diagram conceptually showing the configuration of the leg support member 40b in the third embodiment. Below, among the configurations of the leg support member 40b of the third embodiment, the configurations that are the same as those of the leg support member 40 of the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

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 portion 414. As shown in FIG. The flat plate portion 414 is a substantially flat plate portion that is substantially perpendicular to the vertical direction. The flat plate portion 414 is, for example, a metal plate having a thickness of approximately 1 mm. In this embodiment, the width of the flat plate portion 414 in the left-right direction is substantially the same as the width of the frame portion 411 , while the depth in the front-rear direction of the flat plate portion 414 is shorter than the depth of the frame portion 411 . The flat plate-like portion 414 is joined (for example, welded) to the frame portion 411 along its lateral edge. The flat plate portion 414 covers a portion of the through hole of the frame portion 411 near the center in the front-rear direction.

Further, in the leg support member 40b of the third embodiment, the depth of the frame portion 411 of the fixed portion 41 is substantially the same as the depth of the frame portion 421 of the lower portion 42, while the width of the frame portion 411 of the fixed portion 41 is It is shorter than the width of the frame portion 421 of the portion 42 . That is, when viewed in the vertical direction, the frame portion 421 of the lower portion 42 protrudes to the right and left sides compared to the frame portion 411 of the fixed portion 41 . As a result, in a vertical view, the second region R2 defined by the contour line of the lower portion 42 includes the first region R1 defined by the contour line of the fixing portion 41, and is the first region. The area is larger than R1.

Like the leg support member 40 of the first embodiment, the leg support member 40b of the third embodiment is embedded inside the core member 10 with the lower surface of the lower step portion 42 exposed from the lower surface of the core member 10. (See Figure 5). At this time, the upper surface and the lower surface of the flat plate portion 414 of the fixed portion 41 of the leg support member 40b are also in contact with the material forming the core member 10 . Such a configuration can be realized by insert molding, for example.

As described above, in the leg support member 40b that constitutes the chair 100 of the third embodiment, the fixing portion 41 has the substantially flat plate-like portion 414 that is substantially perpendicular to the vertical direction. Therefore, according to the third embodiment, the contact area between the fixed portion 41 of the leg support member 40b and the core member 10 can be increased, and the existence of the fixed portion 41 allows the contact area between the core member 10 and the leg support member 40b to increase. can be effectively suppressed. Therefore, according to the third embodiment, the leg support member 40b is separated from the core member 10 due to the displacement, and internal separation occurs near the interface between the core member 10 and the leg support member 40b. Therefore, it is possible to effectively prevent the core material from being damaged by squeezing, and the durability of the chair 100 can be effectively improved.

In addition, in the leg support member 40b that constitutes the chair 100 of the third embodiment, the second region R2 defined by the outline of the lower part 42 is defined by the outline of the fixing part 41 when viewed in the vertical direction. It includes the first region R1 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 the seating of a person is transmitted to each leg member 30 via a wider range of the leg support member 40b and the core member 10. The load can be effectively distributed, and the durability of the chair 100 can be effectively improved.

In addition, in the leg support member 40b that constitutes the chair 100 of the third embodiment, the flat plate portion 414 covers a part of the through hole of the frame portion 411 near the center in the front-rear direction. Compared to a configuration in which the entire through-hole of the frame portion 411 is covered, the presence of the flat plate portion 414 effectively suppresses the occurrence of displacement between the core member 10 and the leg support member 40b, while allowing the leg support member 40b to move. , and thus the weight increase of the chair 100 can be suppressed.

D. Variant:
The technology disclosed in this specification is not limited to the above-described embodiments, and can be modified in various forms without departing from the scope of the invention. For example, the following modifications are possible.

The configuration of the chair 100 in the above embodiment is merely an example, and various modifications are possible. For example, the shape, size, forming material, and manufacturing method of each part in the chair 100 of the above-described embodiment are merely examples, and various modifications are possible. Further, although the chair 100 includes the seat portion 102 and the back portion 104 in the above embodiment, the chair 100 may not include the back portion 104 . Further, in the above embodiment, the chair 100 includes the cushion material 20 and the cover member 60, but at least one of these may be omitted.

In the above embodiment, the leg support member 40 has the fixed portion 41 , the lower portion 42 and the connecting portion 43 , but the leg supporting member 40 may not 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 . Further, in the above-described embodiment, the fixed portion 41 of the leg support member 40 has the frame portion 411 , but the fixed portion 41 does not have to have the frame portion 411 . For example, the fixed portion 41 may be configured only from a flat plate-like portion substantially perpendicular to the vertical direction. In addition, the fixed portion 41 may have a portion other than the frame portion 411, which 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, although the lower portion 42 of the leg support member 40 has the frame portion 421 in the above embodiment, the lower portion 42 may not have the frame portion 421 . In the above embodiment, the lower portion 42 of the leg support member 40 has the projecting portion 422, and the leg member 30 is supported by the projecting portion 422. However, even if the leg member 30 is supported by the frame portion 421, good.

In the above-described embodiment, the fixed portion 41 of the leg support member 40 is sandwiched by the core member 10 from above and below and from the left and right inside the core member 10. , and may not be sandwiched by the core material 10 from the left and right. For example, in the above-described first embodiment, the layered space surrounded by the frame portion 411 of the fixed portion 41 is not filled with the material constituting the core material 10, and as a result, the fixed portion 41 is separated from the core from the left and right. A configuration in which the material 10 does not sandwich the material 10 may also be used.

Although the chair 100 includes four leg members 30 in the above embodiment, the number of leg members 30 included in the chair 100 may be three or less, or may be five or more. For example, the chair 100 may have only one leg member 30, and in that case, the chair 100 may be horizontally rotatable about the one leg member 30 as an axis.

10: core material 20: cushion material 21: lower cushion material 22: upper cushion material 30: leg member 31: body portion 32: male screw portion 40: leg support member 41: upper portion 42: lower portion 43: connecting portion 60 : cover member 62: fastener 100: chair 102: seat portion 103: seat surface 104: back portion 105: back surface 411: frame portion 412: protruding portion 413: mesh portion 414: flat portion 421: frame portion 422: protruding portion 423 : Leg mounting portion 424: Diagonal material

Claims (9)

A chair having a seat,
a core material that is formed of a foamed resin and that constitutes at least part of the seat;
a leg support member fixed to the core;
at least one leg member supported by the leg support member;
with
The chair, wherein the leg support member has a fixed portion sandwiched by the core material from above and below inside the core material. A chair according to claim 1,
The chair, wherein the fixed portion of the leg support member has a portion composed of a plurality of rod-shaped portions connected to each other. A chair according to claim 2,
The chair, wherein the portion composed of the plurality of rod-shaped portions connected to each other is a frame-shaped portion having a through-hole extending vertically therethrough. A chair according to any one of claims 1 to 3,
The chair, wherein the fixed portion of the leg support member has a substantially flat plate-like portion that is substantially perpendicular to the vertical direction. A chair according to any one of claims 1 to 4,
The chair, wherein the fixed portion of the leg support member has a net-like portion formed with a large number of through-holes penetrating in the vertical direction. A chair according to any one of claims 1 to 5,
The leg support member further
a lower part arranged below the fixing part, the lower part having a lower surface exposed from the lower surface of the core material and supporting the leg member;
a connecting portion that connects the fixing portion and the lower portion;
a chair. A chair according to claim 6,
The chair, wherein the lower portion of the leg support member has a frame-shaped portion in which a through hole penetrating vertically is formed. A chair according to claim 6 or claim 7,
When viewed in the vertical 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 fixed portion of the leg support member, and , a chair having an area larger than that of said first region. A chair according to any one of claims 6 to 8,
The lower portion of the leg support member has a main portion and a protruding portion that protrudes from the main portion in a substantially horizontal direction,
The chair, wherein the leg members are supported by the protrusions.

Images