Chair load-supporting structure and chair

Abstract

To provide a load support structure for chairs including a pad member liable to remove from a mold, and chair.SOLUTION: A load support structure for chairs comprises a body member, and a pad member attached to the body member. The pad member includes a mounting part 63 having a load support surface 63u, a sidewall part 65 protruding from an outer peripheral edge of the mounting part 63 toward the body member and disposed along the periphery of the body member, and an extension wall part 66, when viewed from a direction facing the load support surface 63u, extending from the sidewall part 65 to a center site of the load support surface 63u and disposed along the periphery of the body member. The extension wall part 66 includes a recessed part 68 opened to an inner peripheral edge of the extension wall part 66 and communicated with both sides in the thickness direction, of the extension wall part 66.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a load-bearing structure for a chair and a chair. [Background technology]

[0002] Chairs equipped with armrests have been known for some time. The armrest comprises an armrest body serving as a strength member, and an armrest pad provided above the armrest body. A downwardly extending piece formed around the entire periphery of the armrest pad engages with an upwardly extending piece formed around the entire periphery of the armrest body, connecting the armrest pad and the armrest body (see, for example, Patent Document 1 listed below). Pad members of load support structures such as armrest pads that support the weight of a seated person are sometimes manufactured from a resin material using a mold. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-42081 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since the downward pieces of the pad member in Patent Document 1 are inclined diagonally inward, when the pad member is manufactured and removed from the mold after injection molding, the downward pieces need to be rolled up outward. Because the downward pieces are continuous around the entire outer periphery of the pad member, they resist the force in the direction that tries to roll them up, which makes it difficult to roll them up.

[0005] Therefore, the present invention has been made in consideration of the above circumstances, and provides a load-supporting structure for a chair and a chair in which the pad member can be easily removed from a mold. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention employs the following means. That is, the load support structure of the chair according to the present invention comprises a main body member and a pad member attached to the main body member, the pad member having a mounting portion having a load support surface, a side wall portion that protrudes from the outer peripheral edge of the mounting portion towards the main body member and is arranged along the periphery of the main body member, and an extension wall portion that extends from the side wall portion towards the center of the load support surface when viewed from the direction facing the load support surface and is arranged along the balance of the main body member, the extension wall portion having a recess that opens at the inner peripheral edge end of the extension wall portion and communicates with both sides in the thickness direction of the extension wall portion The side wall portion has a first side wall portion that protrudes from the outer peripheral edge of the mounting portion toward the main body member by a first length, and a second side wall portion that protrudes from the outer peripheral edge of the mounting portion toward the main body member by a second length that is longer than the first length, and the recess is located between the extending wall portion provided on the first side wall portion and the extending wall portion provided on the second side wall portion. are.

[0007] In the load-support structure for a chair configured in this manner, the extending wall portion provided on the side wall portion of the pad member has a recess formed therein that opens at the inner peripheral edge of the extending wall portion and communicates with both sides of the extending wall portion in the thickness direction. This makes it easy to roll up the side wall portion outward starting from the recess. Therefore, when removing the pad member from the mold, the side wall portion can be rolled up outward to remove the extending wall portion from the mold, making it easy to remove the pad member from the mold. Furthermore, the second length by which the second side wall portion protrudes is longer than the first length by which the first side wall portion protrudes. As a result, the length by which the second side wall portion overlaps the mold is longer, and so it needs to be significantly bent and rolled up, but because a recess is formed between the extending wall portion on the first side wall portion and the extending wall portion on the second side wall portion, the second side wall portion can be significantly bent and rolled up starting from the recess to be removed from the mold.

[0008] Furthermore, the load support structure for a chair according to the present invention comprises a main body member and a pad member attached to the main body member, the pad member having a mounting portion having a load support surface, a side wall portion that protrudes from the outer peripheral edge of the mounting portion towards the main body member and is arranged along the periphery of the main body member, and an extending wall portion that extends from the side wall portion towards the center of the load support surface when viewed from the direction facing the load support surface and is arranged along the periphery of the main body member, the extending wall portion having a recess that opens at the inner peripheral edge end of the extending wall portion and that is connected to both sides in the thickness direction of the extending wall portion, The recessed portion is formed as a pair, and the pair of recessed portions are parallel to the load supporting surface. left and right and when viewed from a direction facing the load support surface, the load support surface is parallel to the load support surface and left and right Orthogonal to the direction Front and rear The positions in the direction are aligned. The extending wall portion may be approximately annular when viewed from the direction facing the load support surface, and the extending wall portion may be arranged in a region forward of the recess from one of the pair of recesses to the other recess.

[0009] In the load-support structure for a chair configured in this manner, the area of the side wall between the pair of recesses can be turned up so as to bend outward as a whole, starting from the pair of recesses that are spaced apart in the first direction and aligned in the second direction, thereby enabling smoother removal from the mold.

[0012] In addition, in the load support structure of the chair according to the present invention, the extending wall portion may be provided with a first locking portion, and the main body member may be provided with a second locking portion that locks to the first locking portion so as to restrict movement in a direction along the load support surface.

[0013] In the load support structure for a chair configured in this manner, the first locking portion of the extending wall portion is locked to the second locking portion provided on the main body member, so that after the pad member is attached to the main body member, movement of the pad member from the main body member in a direction along the load support surface is restricted, and unintentional lifting and detachment are prevented.

[0014] In the load support structure for a chair according to the present invention, an end portion of the extending wall portion extending from the side wall portion may abut against the main body member.

[0015] In the load support structure for a chair configured in this manner, the extending end of the extending wall abuts against the main body member, thereby restricting the movement of the pad member provided on the extending wall in the direction extending from the side wall relative to the main body member.

[0016] In the load support structure for a chair according to the present invention, the load support surface may be an armrest that faces upward and on which the elbow of a user is placed.

[0017] In the load support structure for a chair configured in this manner, the load support surface of the armrest faces upward, and the user places their elbow on the load support surface. Therefore, when removing the pad member of the armrest from the mold, the side wall portion can be rolled up outward to remove the extended wall portion from the mold, making it easy to remove the pad member from the mold.

[0018] In addition, in the load support structure of the chair of the present invention, the main body member has an armrest pad receiving member extending from the seat side where the user sits, and the pad member may protrude forward beyond the armrest pad receiving member so that the occupant faces forward.

[0019] In the load-bearing structure of the chair configured in this way, the pad member protrudes further forward than the armrest pad receiving member, so when a seated person grasps the lower part of the front part of the armrest with their hand, they come into contact with the pad member, providing a pleasant feel.

[0020] A chair according to the present invention includes any one of the armrests described above.

[0021] In a chair configured in this manner, when removing the armrest padding from the mold, the side wall portion can be rolled up outward to remove the extended wall portion from the mold, making it easy to remove the padding from the mold. [Effects of the Invention]

[0022] According to the load-supporting structure for a chair and the chair of the present invention, the pad member can be easily removed from the mold. [Brief explanation of the drawings]

[0023] [Figure 1] 1 is a perspective view of a chair according to a first embodiment, seen from the front left. [Figure 2] FIG. 2 is an exploded perspective view of the armrest according to the first embodiment, seen from the front left. [Figure 3] FIG. 2 is a horizontal cross-sectional view of the armrest according to the first embodiment. [Figure 4] FIG. 2 is a perspective view of the inner shell according to the first embodiment, as viewed from below. [Figure 5] FIG. 2 is a perspective view of the mounting member according to the first embodiment, seen from below. [Figure 6] FIG. 2 is a plan view of the mounting member according to the first embodiment, seen from below. [Figure 7] FIG. 2 is a side view of the mounting member according to the first embodiment, viewed from the left and right direction. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 7. [Figure 9] FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. [Figure 10] 8 is a cross-sectional view taken along line XX in FIG. 7. [Figure 11]FIG. 6 is an enlarged view of a portion XI in FIG. 5. [Figure 12] FIG. 2 is a cross-sectional view taken along line XII-XII in FIG. [Figure 13] 8 is a cross-sectional view of the mounting member according to the second embodiment taken along line XX in FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0024] Next, an embodiment of the present invention will be described with reference to the drawings. In the following and other embodiments, corresponding components may be designated by the same reference numerals, and their description may be omitted. In the following description, expressions indicating relative or absolute arrangements, such as "parallel," "orthogonal," "center," and "coaxial," not only strictly refer to such arrangements, but also refer to a state in which the components are relatively displaced by an angle or distance to a degree that allows tolerance or the same function to be obtained. In this embodiment, "facing" does not only refer to a case in which the orthogonal directions (normal directions) of two surfaces are aligned with each other, but also includes a case in which the normal directions intersect.

[0025] (First embodiment) [Chair 1] FIG. 1 is a perspective view of the chair 1 as seen from the front left. As shown in FIG. 1, the chair 1 comprises a lower support structure 2, a seat 3, a backrest 4, and armrests (weight-bearing structures) 5. In the following description, the directions of front, back, up, down, left, right, etc. are the same as the directions of a person (seater) sitting in a normal posture on chair 1. In this case, the arrow UP in the drawings indicates upward, the arrow FR indicates forward, and the arrow LH indicates left. Also, in the following description, for each component, the side away from the center in the front, back, and left, right directions (width direction) may be referred to as the outside, and the side toward the center may be referred to as the inside.

[0026] <Lower support structure 2> The lower support structure 2 includes legs 11, a base 12, and a backrest support (not shown). The legs 11 include multi-legs 14 and a pedestal 15. Each leg of the multi-legs 14 is fitted with a caster 16 that can run on the floor.

[0027] The leg pillar 15 stands upright from the center of the multi-legged leg 14. A gas spring (not shown) that serves as a lifting mechanism for the chair 1 is built into the leg pillar 15. The gas spring is configured such that an inner cylinder is supported in the leg pillar 15 so as to be able to move up and down and rotate relative to an outer cylinder provided within the leg pillar 15.

[0028] The support base 12 is connected to the upper end of the leg pillar 15. The support base 12 supports the seat 3 from below. The support base 12 supports the backrest 4 via the backrest support section so that it can tilt, and also supports the seat 3 so that it can tilt in conjunction with the backrest support section. The support base 12 is equipped with an operating section for operating the gas spring, etc.

[0029] <Location 3> The seat 3 has a seat receiving member 21 and a seat body 22. The seat receiving member 21 is connected to the upper part of the support base 12 so as to be movable forward and backward. The seat receiving member 21 slides rearward together with the seat body 22 relative to the support base 12 in conjunction with the rearward tilt of the backrest 4 relative to the support base 12. The seat receiving member 21 is a strong member made of a metal material such as drawn sheet metal or aluminum die-cast, and has a saucer shape that is open on the top in the vertical direction. The seat receiving member 21 may also be molded from injection-molded synthetic resin, in which case it may have a shape other than a saucer shape that is open on the top in the vertical direction. The seat body 22 is supported by the seat receiving member 21. The seat 3 supports the buttocks of a person seated on the chair 1 from below.

[0030] <Backrest 4> The backrest 4 is connected to the rear end of the backrest support part so as to be able to tilt. The backrest 4 may be configured so as not to be able to tilt relative to the support base 12. The backrest 4 supports the waist, back, etc. of a person seated on the chair 1 from behind.

[0031] <Armrest 5> FIG. 2 is an exploded perspective view of the armrest 5 as seen from the front left. The armrest 5 is supported by an armrest support member 24 attached to the seat receiving member 21. As shown in FIG. 2, the armrest support member 24 has an exterior portion 25, a tubular portion 26, and an interior portion 27. A lower portion 25a of the exterior portion 25 is attached to the seat receiving member 21 (see FIG. 1) and is formed in an L-shape when viewed from the front, extending outward in the left-right direction from the seat receiving member 21 and upward. The exterior portion 25 is formed with a cylindrical portion 25b that extends vertically and has a hollow interior. The tubular portion 26 is formed in a tubular shape and is disposed inside the cylindrical portion 25b of the exterior portion 25. The interior portion 27 is disposed inside the tubular portion 26. The exterior portion 25, the tubular portion 26, and the interior portion 27 are connected and integrated. Alternatively, the exterior portion 25 and the tubular portion 26 may be connected and integrated, and the interior portion 27 may be configured to be movable vertically relative to these members.

[0032] The armrest 5 includes a main body member 50 and a pad member 60. The pad member 60 is supported by the main body member 50.

[0033] <Main body member 50> The main body member 50 has an armrest pad receiving member 51 and an inner shell 52 .

[0034] Armrest pad receiving member 51 is fixed to the upper end of interior portion 27 via mounting member 28. Armrest pad receiving member 51 is a resin member that provides strength against the load input from the elbows and arms of the seated occupant via pad member 60. Armrest pad receiving member 51 has a flat plate portion 511, an outer wall portion 512, an inner wall portion 514, and a plurality of ribs 513.

[0035] FIG. 3 is a horizontal cross-sectional view of the armrest. As shown in FIG. 3, the flat plate portion 511 is formed in a flat plate shape. The plate surface of the flat plate portion 511 faces the vertical direction. The flat plate portion 511 has a shape that is long in the front-to-rear direction. The flat plate portion 511 has an attachment hole 511a that penetrates in the vertical direction. The upper end of the interior portion 27 (see FIG. 2) of the armrest support member 24 is inserted into the attachment hole 511a. The rear portion of the flat plate portion 511 has an attachment hole 511b that penetrates in the vertical direction.

[0036] The outer wall portion 512 extends upward from both left and right ends and the rear end of the flat plate portion 511. In other words, when viewed from above, the outer wall portion 512 has a substantially U-shape that opens forward.

[0037] The inner wall portion 514 stands upright from the flat plate portion 511. The inner wall portion 514 is located slightly inward from both the left and right ends of the flat plate portion 511, slightly inward from the rear end portion, and at the front end portion. When viewed from above, the inner wall portion 514 has a generally annular shape that is long in the front-to-rear direction.

[0038] The ribs 513 extend upward from the flat plate portion 511. The plurality of ribs 513 extend in the front-rear and left-right directions, etc.

[0039] A pair of first protrusions 515 and a pair of second protrusions 516 that protrude forward are provided on a front wall 514a located on the front side of the inner wall 514. The first protrusions 515, the second protrusions 516, the second protrusions 516 and the first protrusions 515 are arranged in this order at intervals from each other in the left-right direction.

[0040] The side wall portions of the inner wall portion 514 located on both the left and right sides are formed with engagement grooves 517 recessed inward in the left-right direction.

[0041] FIG. 4 is a perspective view of the inner shell 52 as seen from below. 4, the inner shell 52 is a resin member for obtaining strength. The inner shell 52 has an inner flat plate portion 521, an inner outer wall portion 522, and an inner inner wall portion 524.

[0042] The inner flat plate portion 521 is formed in a substantially flat plate shape. The inner flat plate portion 521 has a shape that bulges slightly upward. As shown in FIG. 2, a plurality of first through holes 521d that penetrate in the up-down direction are formed in the front portion of the inner flat plate portion 521. A plurality of second through holes 521e that penetrate in the up-down direction are formed in the inner flat plate portion 521 forward of the first through holes 521d.

[0043] As shown in FIG. 4, the inner outer wall portion 522 extends downward from both left and right ends, the front end, and the rear end of the inner flat plate portion 521. When viewed from below, the inner outer wall portion 522 has a generally annular shape that is long in the front-to-rear direction. The downward extension length of the front wall portion 522a located on the front side of the inner outer wall portion 522 is longer than the downward extension length of the wall portion 522b located on the other side of the inner outer wall portion 522. The lower end of the boundary portion 522c between the front wall portion 522a and the wall portion 522b gradually slopes downward as it extends forward. As a result, the downward extension length of the boundary portion 522c gradually increases from the wall portion 522b side toward the front wall portion 522a side.

[0044] The inner inside wall portion 524 extends downward from the inner flat plate portion 521. The inner inside wall portion 524 is located slightly inward from both the left and right ends and the rear end portion of the inner flat plate portion 521. When viewed from below, the inner inside wall portion 524 has a generally U-shape that opens forward.

[0045] As shown in FIG. 3, the inner inner wall portion 524 is disposed between the outer wall portion 512 and the inner wall portion 514 of the armrest pad receiving member 51.

[0046] As shown in Figure 4, a screw mounting portion 521a protruding downward is provided at the rear of the underside of the inner flat plate portion 521. A female screw (not shown) is formed inside the screw mounting portion 521a. A screw (not shown) inserted from below into the mounting hole 511b (see Figure 3) of the armrest pad receiving member 51 is threaded into the female screw of the screw mounting portion 521a. This connects the armrest pad receiving member 51 and the inner shell 52 together, forming a single unit.

[0047] The inner flat plate portion 521 is provided with a claw portion 531 extending downward. A notch 524a is formed in the approximate center in the front-to-rear direction of portions of the inner inside wall portion 524 located on both the left and right sides. The claw portion 531 is disposed in the notch 524a of the inner inside wall portion 524. A locking claw 531a extending inward in the left-to-right direction is provided at the lower end of the claw portion 531. As shown in FIG. 3, the claw portion 531 is inserted into the engagement groove 517 of the armrest pad receiving member 51, and the locking claw 531a is locked to the inner wall portion 514 that forms the engagement groove 517.

[0048] As shown in Fig. 4, an inner lower plate 525 is provided at the lower end of the front wall 522a of the inner outer wall 522. The inner lower plate 525 is formed in a plate shape. The lower surface of the inner lower plate 525 faces downward and slightly forward. The inner lower plate 525 is formed with a plurality of recesses 525e that are recessed upward.

[0049] The front portion of the inner flat plate portion 521 and the inner lower plate portion 525 are connected by connecting walls 532, 533. The connecting walls 532, 533, 532 are arranged in this order at intervals in the left-right direction. The number of connecting walls 532, 533 can be set as appropriate. When viewed from above, the connecting walls 532, 533 are located between adjacent first through-holes 521d. As shown in FIG. 3, the connecting wall 532 is fitted between the first protrusion 515 and the second protrusion 516 of the armrest pad receiving member 51. This restricts relative movement between the armrest pad receiving member 51 and the inner shell 52 in the left-right direction.

[0050] As shown in Fig. 4, connecting wall 533 is provided with protruding piece 533a extending rearward. The lower portion of protruding piece 533a is inclined upward as it extends rearward. A locking portion 533b is provided at the front portion of protruding piece 533a. When viewed from the front, locking portion 533b has a U-shape that opens upward.

[0051] <Pad member 60> 2, the pad member 60 has a cushion material 61 and a cover member 62. The elastic modulus of the cushion material 61 and the cover member 62 is smaller than the elastic modulus of the main body member 50.

[0052] The cushion material 61 is made of, for example, urethane. The cushion material 61 is placed on the armrest pad receiving member 51. The outer shape of the lower surface 61d of the cushion material 61 is substantially the same as the outer shape of the upper surface 521u of the inner flat plate portion 521 of the armrest pad receiving member 51. The outer shape of the upper surface 61u of the cushion material 61 is slightly smaller than the outer shape of the lower surface 61d. The outer peripheral end surface 61s of the cushion material 61 is a gently curved surface that connects the outer peripheral edge of the upper surface 61u and the outer peripheral edge of the lower surface 61d.

[0053] The mounting member 62 is made of, for example, an elastomer. The mounting member 62 has a mounting portion 63 and an outer peripheral wall portion 64.

[0054] The mounting portion 63 is formed in a substantially flat plate shape. The outer shape of the mounting portion 63 is substantially the same as the shape of the upper surface 61u of the cushion material 61. The mounting portion 63 covers the upper side of the upper surface 61u of the cushion material 61. The upper surface of the mounting portion 63 is a load support surface 63u that supports the load from the arms of an occupant seated on the seat 3 of the chair 1 when the occupant places their arms on the armrests 5. The load support surface 63u has a shape that bulges slightly upward at the center in the front-rear and left-right directions.

[0055] Fig. 5 is a perspective view of the mounting member 62 as seen from below, and Fig. 6 is a plan view of the mounting member 62 as seen from below. As shown in FIGS. 5 and 6, the outer peripheral wall portion 64 is provided around the entire outer peripheral edge portion of the mounting portion 63.

[0056] As shown in FIG. 5, the outer peripheral wall 64 has a side wall 65 and a bent wall (extending wall) 66. The side wall 65 protrudes from the outer peripheral edge of the mounting portion 63 toward the main body member 50 (see FIG. 2). In this embodiment, the side wall 65 protrudes downward from the outer peripheral edge of the mounting portion 63. The side wall 65 is disposed along the periphery of the main body member 50. The mounting portion 63 and the outer peripheral wall 64 form an inner peripheral storage space s1 on the underside 63d of the mounting portion 63 that can store the inner shell 52. Note that in this embodiment, the inner shell 52 is described as part of the main body member 50. However, depending on the size of the inner shell 52, it is possible to support the inner shell 52 on the armrest pad support member 51 while the inner surface of the lower end of the side wall 65 or the upper surface of the bent wall 66 holds the inner shell 52.

[0057] FIG. 7 is a side view of the mounting member 62 as viewed from the left and right direction. The length of the side wall 65 protruding from the outer peripheral edge of the mounting portion 63 rearward of the boundary L shown in FIG. 7 is defined as length M1 (first length). The length of the side wall 65 protruding from the outer peripheral edge of the mounting portion 63 forward of the boundary L is defined as length M2 (second length). Length M2 is longer than length M1. The portion of the side wall 65 having length M1 is defined as the first side wall 65A. The portion of the side wall 65 having length M2 is defined as the second side wall 65B. The portion of the side wall 65 including the boundary L is defined as the third side wall 65C. In other words, the third side wall 65C is a region connecting the first side wall 65A and the second side wall 65B. The third side wall portion 65C has a length that protrudes from the outer peripheral edge of the mounting portion 63 and gradually increases from the first side wall portion 65A side toward the second side wall portion 65B side.

[0058] As shown in Fig. 5, the bent wall portion 66 is bent from the lower end of the side wall portion 65 toward the center of the mounting portion 63 when viewed from below. In other words, the bent wall portion 66 is bent from the lower end of the side wall portion 65 toward the center of the load support surface 63u when viewed from the direction facing the load support surface 63u. The bent wall portion 66 is arranged along the periphery of the main body member 50 (see Fig. 2). Note that the bent wall portion 66 may extend from the lower end of the side wall portion 65 so as to curve toward the center of the mounting portion 63 when viewed from below.

[0059] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 5 and 8, a downwardly extending downward portion 662 is connected to the bent wall portion 66 (hereinafter referred to as the "first bent wall portion 66A") provided on the first side wall portion 65A. A bent portion 663 is connected to the lower end of the downward portion 662 and extends toward the center of the mounting portion 63 when viewed from below.

[0060] FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. As shown in Fig. 9, the bent wall portion 66 (hereinafter referred to as "second bent wall portion 66B") provided on the second side wall portion 65B has a shape that is wide in the left-right direction (see Fig. 5). As shown in Fig. 11, the rear end portion of the second bent wall portion 66B is provided with an upwardly extending portion (extending end portion) 665 (see Fig. 5) that extends upward.

[0061] Fig. 10 is a cross-sectional view taken along line XX in Fig. 7. Fig. 11 is an enlarged view of part XI in Fig. 5. As shown in FIGS. 10 and 11, the third side wall 65C does not include a folded wall 66, a downward portion 662, or a folded portion 663. As shown in FIG. 11, a recess 68 that opens at the inner peripheral edge of the folded wall 66 is formed in the region including the boundary L. The recess 68 is formed between the first folded wall 66A and the second folded wall 66B. The recess 68 opens toward both the extension line (imaginary line N) of the end face 663a of the folded portion 663 received by the first folded wall 66A and the vertical direction. The recess 68 connects the first folded wall 66A and the second folded wall 66B in the thickness direction (vertical direction).

[0062] As shown in Figure 5, the folded wall portion 66 is formed with a first folded wall portion 66A and a second folded wall portion 66B to have a generally annular shape when viewed from below. A pair of recesses 68 are formed in the front and on both left and right sides of the circumferential direction (direction along the outer peripheral edge of the mounting portion 63) of the folded wall portion 66. The pair of recesses 68 are spaced apart in the left-right direction (first direction) and are positioned so that their positions are aligned in the front-to-rear direction (second direction). The folded wall portion 66 is divided by the recesses 68.

[0063] As shown in FIG. 11, the downward portion 662 provided on the first bent wall portion 66A and the surface 663b of the bent portion 663 facing the recessed portion 68 are aligned in the left-right direction and the front-rear direction.

[0064] An end surface 665a of the upward portion 665 of the second bent wall portion 66B is provided with a locking ring-shaped portion (first locking portion) 667 that protrudes rearward. The locking ring-shaped portion 667 has a ring shape that is long in the left-right direction when viewed from above. A through-hole 667s is formed inside the locking ring-shaped portion 667.

[0065] FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. 12, the cushion material 61 and the covering member 62 protrude further forward than the armrest pad receiving member 51. The elastic modulus of the cushion material 61 and the covering member 62 is smaller than that of the main body member 50, so when a seated person grasps the lower part of the front part of the armrest 5 with their hand, it feels good to the touch.

[0066] The locking portion (second locking portion) 533b of the inner shell 52 is inserted from above and locked into the through-hole 667s of the locking ring portion 667 provided in the second side wall portion 65B of the mounting member 62. This prevents the mounting member 62 from moving in the front-to-back and left-to-right directions relative to the inner shell 52, while attaching the mounting member 62 to the inner shell 52.

[0067] The upward portion 665 of the second bent wall portion 66B of the covering member 62 is able to abut against or be positioned with a slight gap against the front end portion 511c of the flat plate portion 511 of the armrest pad receiving member 51. This prevents the covering member 62 from moving backward.

[0068] In the chair 1 configured as described above, the folded wall portion 66 provided on the side wall portion 65 of the pad member 60 of the armrest 5 has a recess 68 that opens at the inner peripheral edge of the folded wall portion 66 and communicates with both sides of the folded wall portion 66 in the thickness direction. This makes it easy to roll up the side wall portion 65 outward starting from the recess 68. Therefore, when the pad member 60 is removed from a mold (part of the mold is shown by a two-dot chain line D in FIG. 7) arranged inside the pad member 60, the side wall portion 65 can be rolled up outward (see arrow B in FIG. 7) to remove the folded wall portion 66 from the mold, making it easy to remove the pad member 60 from the mold. Note that the "outward" rolling up of the side wall portion 65 refers to the direction in which the lower end of the side wall portion 65, which is the end of the side wall portion 65 on the main body member 50 side, moves away from the underside 63d of the covering portion 63. In other words, the lower end of the side wall portion 65 moves away from the center of the inner circumferential accommodation space s1.

[0069] In addition, starting from a pair of recesses 68 that are spaced apart in the left-right direction and aligned in the front-rear direction, the front portion of the outer peripheral wall portion 64 can be turned up so as to be bent outward as a whole in the area sandwiched between the pair of recesses 68. This allows for even smoother removal from the mold.

[0070] Furthermore, the second length M2 of protrusion of the second side wall portion 65B is longer than the first length M1 of protrusion of the first side wall portion 65A. This increases the length of coverage of the second side wall portion 65B with the mold, so it is necessary to significantly bend and roll up the second side wall portion 65B, but because the recess 68 is formed between the first folded wall portion 66A and the second folded wall portion 66B, the second side wall portion 65B can be significantly bent and rolled up starting from the recess 68 to be removed from the mold.

[0071] Furthermore, the locking portion 533b provided on the main body member 50 is locked to the upward portion 665 provided on the second bent wall portion 66B of the covering member 62. Therefore, after the pad member 60 is attached to the main body member 50, the movement of the pad member 60 in the up-down and left-right directions from the main body member 50 is restricted, and the pad member 60 is prevented from unintentionally rolling up and coming off.

[0072] Furthermore, the upward portion 665 of the second bent wall portion 66B of the covering member 62 is able to abut against or be positioned with a small gap against the front end portion 511c of the flat plate portion 511 of the armrest pad receiving member 51. This restricts the rearward movement of the covering member 62.

[0073] Furthermore, the pad member 60 protrudes further forward than the armrest pad receiving member 51. Therefore, when a seated occupant grasps the lower part of the front part of the armrest 5 with their hands, they come into contact with the pad member 60, providing a pleasant feel.

[0074] (Second embodiment) Next, a chair covering member according to a modified example of the second embodiment of the present invention will be described mainly with reference to Figure 13. In the modified example described below, the same reference numerals will be used to designate components corresponding to the above-described embodiment, and the description thereof may be omitted. FIG. 13 is a cross-sectional view of the mounting member according to the second embodiment taken along line XX in FIG. As shown in FIG. 13, the lower end of the third side wall portion 65C is provided with a folded wall portion 66C that is folded toward the center of the mounting portion 63 when viewed from below. The folded wall portion 66C does not have a downward portion 662 or a folded portion 663. The protruding length A2 of the folded wall portion 66C is shorter than the protruding length A1 of the first folded wall portion 66A and the protruding length of the second folded wall portion 66B (see FIG. 9). As a result, in the region including the boundary portion L, a recessed portion 68X that opens at the inner peripheral edge of the folded wall portion 66 is formed. In other words, the recessed portion 68X opens toward both the extension line (imaginary line N) of the end face 663a of the folded portion 663 received by the first folded wall portion 66A and in the vertical direction.

[0075] In the chair 1 configured in this manner, the folded wall portion 66 provided on the side wall portion 65 of the pad member 60 has a recess 68X formed between the first folded wall portion 66A and the second folded wall portion 66B, the recess 68X opening at the inner peripheral edge of the folded wall portion 66. This makes it easy to roll up the side wall portion 65 outward starting from the recess 68X. Therefore, when removing the pad member 60 from the mold, the folded wall portion 66 can be removed from the mold by rolling up the side wall portion 65 outward, making it easy to remove the pad member 60 from the mold.

[0076] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

[0077] For example, in the above embodiment, the armrest 5 is used as an example of the load-supporting structure of the chair, but the present invention is not limited to this, and the seat 3 or the backrest 4 may also be used.

[0078] In the embodiment described above, the recess 68 is formed between the first bent wall portion 66A and the second bent wall portion 66B, but the present invention is not limited to this. The recess may be formed in a portion of the first bent wall portion 66A in the circumferential direction, or in a portion of the second bent wall portion 66B in the circumferential direction.

[0079] In addition, in the embodiment described above, the locking portion 533b provided on the main body member 50 is locked to the upward portion 665 provided on the mounting member 62, but the present invention is not limited to this. As long as the mounting member 62 and the main body member 50 are fixed, there is no need to provide the first locking portion and the second locking portion.

[0080] In the above embodiment, the locking portion 533b is formed on the inner shell 52, but the present invention is not limited to this. The locking portion 533b may be formed on the armrest pad receiving member 51. In that case, the main body member 50 may be formed only by the armrest pad receiving member 51, without providing the inner shell 52.

[0081] In the embodiment described above, the upward portion 665 of the second bent wall portion 66B of the covering member 62 can abut against the front end portion 511c of the flat portion 511 of the armrest pad receiving member 51, but the present invention is not limited to this. The extending end portion of the bent wall portion 66 may abut only against the inner shell 52, or may abut against both the armrest pad receiving member 51 and the inner shell 52.

[0082] In addition, within the scope of the spirit of the present invention, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate. [Explanation of symbols]

[0083] 1 chair 2 Lower support structure 3 seats 4 Backrest 5 Armrest (support structure) 11 Legs 12 Supports 24 Armrest support member 50 Main body member 51 Armrest pad support member 52 Inner shell 60 Pad member 61 Cushioning material 63 Mounting Department 63u load bearing surface 65 Side wall 65A 1st side wall part 65B 2nd side wall part 66 Bent wall section 66C bent wall section 68 Recess 68X Recess 533b Locking part (second locking part) 667 Locking ring portion (first locking portion) L border

Claims

1. a body member; a pad member attached to the body member, The pad member is a mounting portion having a load-bearing surface; a sidewall portion that protrudes from the outer peripheral edge of the mounting portion toward the main body member and is disposed along the periphery of the main body member; an extending wall portion extending from the side wall portion toward the center of the load support surface when viewed from a direction facing the load support surface and disposed along the periphery of the main body member, The extending wall portion has a recess formed therein, the recess opening at an inner peripheral edge of the extending wall portion and communicating with both sides of the extending wall portion in a thickness direction, The side wall portion is a first side wall portion that protrudes a first length from an outer peripheral edge portion of the mounting portion toward the main body member; a second side wall portion protruding from an outer peripheral edge portion of the mounting portion toward the main body member by a second length longer than the first length, A load-supporting structure for a chair, wherein the recess is located between the extending wall portion provided on the first side wall portion and the extending wall portion provided on the second side wall portion.

2. A main body member, a pad member attached to the body member, The pad member is a mounting portion having a load-bearing surface; a sidewall portion that protrudes from the outer peripheral edge of the mounting portion toward the main body member and is disposed along the periphery of the main body member; an extending wall portion extending from the side wall portion toward the center of the load support surface when viewed from a direction facing the load support surface and disposed along the periphery of the main body member, The extending wall portion has a recess formed therein, the recess opening at an inner peripheral edge of the extending wall portion and communicating with both sides of the extending wall portion in a thickness direction, The recessed portions are formed in pairs, The pair of recesses are the load support members are spaced apart in a left-right direction parallel to the load support surface, and are arranged so that, when viewed from a direction facing the load support surface, their positions in a front-rear direction parallel to the load support surface and perpendicular to the left-right direction are aligned, the extending wall portion has a substantially annular shape when viewed from a direction facing the load support surface, A load-supporting structure for a chair, wherein the extending wall portion is arranged in a region forward of the recess from one of the pair of recesses to the other recess.

3. The side wall portion is a first side wall portion that protrudes a first length from an outer peripheral edge portion of the mounting portion toward the main body member; a second side wall portion protruding from an outer peripheral edge portion of the mounting portion toward the main body member by a second length longer than the first length, 3. The load-supporting structure for a chair according to claim 2, wherein the recess is located between the extending wall portion provided on the first side wall portion and the extending wall portion provided on the second side wall portion.

4. The extending wall portion is provided with a first locking portion, 4. A load support structure for a chair as described in any one of claims 1 to 3, wherein the main body member is provided with a second locking portion that is locked to the first locking portion so as to restrict movement in a direction along the load support surface.

5. 5. The load-supporting structure for a chair according to claim 1, wherein an end of the extending wall portion extending from the side wall portion abuts against the main body member.

6. 6. The load-supporting structure of a chair according to claim 1, wherein the load-supporting surface is an armrest that faces upward and on which a user places their elbow.

7. The body member includes: The armrest pad receiving member extends from the seat side on which the user sits, 7. The load-supporting structure for a chair according to claim 6, wherein the pad member projects forward beyond the armrest pad receiving member when the seated person faces forward.

8. A chair equipped with an armrest according to claim 6 or 7.

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