chair

Abstract

To easily form a seat.SOLUTION: A chair 1 according to an embodiment includes: a seat 2 having an elastically-deformable sheet-like fabric with a seating surface on which a user can be seated, and a pair of rods 15 spaced apart in a right-left direction and between which the fabric is attached; and a support structure 3 having a pair of seat support parts 37 spaced apart in a right-left direction and rotationally supporting the seat 2 about a shaft along the right-left direction. The seat 2 includes supported parts 13 each projecting from the rod 15 toward each seat support part 37 and rotationally supported about the shaft. The rod 15 includes a first engagement groove 15a that is open outward in the right-left direction such as to be engageable with the fabric and in a range not overlapping with the supported part 13. The seat 2 includes groove forming members 70 each of which is attached to a position facing the supported part 13 in the rod 15, and provided in an inner side in the right-left direction with respect to the supported part 13 in a range including the range overlapping with the supported part 13 when viewed in the right-left direction, and each of which has a second engagement groove 70a that is continuous with the first engagement groove 15a.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] Conventionally, chairs have been known that include a seat having an elastically deformable sheet-like seat component having a seating surface on which a person can sit, a pair of rods spaced apart in the width direction of the chair and on which the seat component is supported, and a support structure having a pair of seat support parts spaced apart in the width direction and supporting the seat so that it can rotate around an axis along the width direction. For example, in Patent Document 1, the seat body is provided with a pair of seat-side fixed pieces corresponding to a pair of back-side connecting pieces of the backrest. The seat body is connected to the seat-side fixed pieces via an axle extending in the left-right direction, making it rotatable around the axle. The seat body is formed by stretching a sheet-like material that serves as the seating surface in an area surrounded by a rectangular frame body in a plan view. The frame body is formed by stacking a front frame body and a rear frame body in the front-to-back direction. The sheet-like material is stretched over the front frame body. In seats constructed in this manner by stretching a sheet-like seat component over a frame body, it is common to stretch the seat component over the frame body by engaging the peripheral edge of the seat component with an engaging groove in the frame body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-198901 Summary of the Invention [Problem to be solved by the invention]

[0004] However, because the seat-side fixed piece rises above the sheet-like member, it is not easy to adopt a method of forming an engagement groove on the outer periphery of the frame body and engaging the peripheral edge of the sheet-like member with the engagement groove of the frame body. On the other hand, if an engagement groove is formed in a position on the frame body that is more inward than the seat-side fixed piece, the seat-side fixed piece may be positioned in the direction of the mold removal to open the engagement groove, making it impossible to mold the entire frame in one go using the same mold. In this case, one additional molding step is required, leaving room for improvement in terms of making it easier to mold the seat.

[0005] In view of the above circumstances, an object of the present invention is to provide a chair whose seat can be easily shaped. [Means for solving the problem]

[0006] A chair according to one aspect of the present invention includes: a seat-forming member having a seating surface on which a seated person can sit and which is elastically deformable; It is formed by connecting multiple rods together, The seating surface component Stretched inside will be Rectangular seat frame and a locus with ,before Record Chair Supported so as to be rotatable around an axis along the width direction Ruza a support structure having a support portion, and the seat Seat frame a supported portion that projects from the seat support portion toward the seat support portion and is supported rotatably around the axis, and the rod member is capable of engaging with the seat surface constituent member. Before The above-mentioned support portion is provided so as not to overlap with the above-mentioned support portion. It is in the opposite direction to the inside of the seat frame. The seat has a first engagement groove that opens outward, Seat frame attached to a portion facing the supported portion in ,before a range including a range overlapping with the supported portion, The inner The present invention is characterized in that it comprises a groove forming member having a second engagement groove provided in the groove forming member and continuing to the first engagement groove.

[0007] According to this configuration, the first engagement groove opens in a range that does not overlap with the supported portion when viewed from the width direction, so the supported portion is not positioned in the direction of removal of the mold used to open the first engagement groove. Therefore, by sliding the mold in the same direction, the supported portion and the first engagement groove can be molded at the same time using the same mold. This makes it easy to mold the seat. In addition, because the groove-forming member attached to the rod has a second engagement groove that is continuous with the first engagement groove, the peripheral edge of the seat component can be engaged along the first and second engagement grooves, allowing the seat component to be quickly tensioned.

[0008] In one aspect of the present invention, a gap greater than or equal to the thickness of the seating surface constituent member may be formed between the supported portion and the groove forming member. With this configuration, the gap between the supported portion and the groove forming member can be used as a working space when engaging the peripheral portion of the seat component with the second engagement groove, allowing the seat component to be quickly tensioned.

[0011] In one aspect of the present invention, the groove forming member is Multiple The rod Among them, the rod member facing the supported portion It may be fixed with a fastening member. According to this configuration, the groove forming member can be firmly fixed. In one aspect of the present invention, a mounting portion to which the groove forming member is attached is formed at a corner of the seat frame, and the mounting portion may have a female thread portion to which the fastening member can be screwed. In one aspect of the present invention, the female threaded portion may be open upward.

[0012] In one aspect of the present invention, the groove forming member is Insertion having a through hole, The groove forming member may include an engagement flange located outside the insertion hole in the groove forming member, the engagement flange forming the second engagement groove together with an upper surface of the rod.

[0013] In one aspect of the present invention, The insertion hole may be formed in a portion of the groove forming member that extends downwardly from an inner end of a portion where the engagement flange is formed in the groove forming member. In one aspect of the present invention, the seat may further include a seat-side connecting member that connects a pair of opposing rods among the plurality of rods in a direction intersecting the longitudinal direction of the rods. In one aspect of the present invention, the supported portion and the groove forming member may be disposed in a position on the seat frame that is spaced apart from the seat-side connecting member in the front-rear direction. In one aspect of the present invention, the supported portion and the groove forming member may be disposed on the seat frame behind the seat-side connecting member. In one aspect of the present invention, the seat may further include a leg-side connecting member that connects the pair of leg constituent members together, and the seat-side connecting member may abut against the leg-side connecting member when the seat is in an in-use state. [Effects of the Invention]

[0014] According to the present invention, the seat can be easily molded. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view of a chair according to an embodiment. [Figure 2] FIG. 2 is a front view of the chair according to the embodiment. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. 2 is a left side view of the seat in a stored state according to the embodiment. [Figure 7] FIG. 2 is a top view of a rear right corner of the seat according to the embodiment. [Figure 8] FIG. 8 is a top view of the state in which the arm covers are removed in FIG. 7. [Figure 9] FIG. 9 is a top view of the state in which the groove forming member in FIG. 8 has been removed. [Figure 10] FIG. 8 is a front view including a cross section XX of FIG. 7. [Figure 11] FIG. 10 is a front view including a cross section taken along the line XI-XI in FIG. 7. [Figure 12] FIG. 8 is a front view including a cross section taken along the line XII-XII in FIG. 7. [Figure 13] FIG. 8 is a left side view including a cross section taken along the line XIII-XIII in FIG. 7 . [Figure 14] 10A and 10B are explanatory views of the operation of the engaging claw according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In each drawing, the same components are assigned the same reference numerals. In the embodiment, an example of a chair will be described, which includes a seat having a seating surface on which a person can sit, and a support structure that supports the seat so that the seat can rotate about an axis along the width direction of the chair between a use state in which a person can sit and a storage state in which the seat is upright relative to the use state. In the embodiment, the installation surface on which the chair is placed is a horizontal plane.

[0017] [chair] As shown in Fig. 1, chair 1 comprises a seat 2, a support structure 3, a backrest 4, and armrests 5. The seat 2, backrest 4, and armrests 5 are supported by the support structure 3. Figs. 1 to 5 show the seat 2 in use. Fig. 6 shows the seat 2 in a stored state.

[0018] In the following explanation, unless otherwise specified, directions such as front, back, up, down, left, and right will be described as referring to the side in front of a person seated in a normal posture on the seat 2 of the chair 1 placed on a horizontal surface in an in-use state as "front," and the opposite side as "rear." In other words, the direction perpendicular to the plane of the paper shown in Figure 2 is referred to as the "front-back direction (depth direction of the chair 1)." Furthermore, the normal direction (vertical direction) to the horizontal surface is referred to as the "up-down direction (height direction of the chair 1)." Furthermore, the direction perpendicular to the front-back direction and up-down direction is referred to as the "left-right direction (width direction of the chair 1)." In the figure, the front is indicated by an arrow FR, the up is indicated by an arrow UP, and the left is indicated by an arrow LH.

[0019] [seat] As shown in FIG. 1, the seat 2 includes an upholstery 10 (seat surface component) having a seating surface 10a on which a person can sit, a rectangular seat frame 11 on which the upholstery 10 is stretched, a seat-side connecting member 12 extending in the left-right direction, a supported portion 13 supported so as to be rotatable about an axis 9 (see FIG. 12), an inner periphery cover 50 (cover, see FIG. 4) that covers the inner periphery of the seat frame 11, an arm cover 60 that covers the supported portion 13, and a groove-forming member 70 (see FIG. 4) that is arranged in an area facing the supported portion 13. When the seat 2 is in use, the seat-side connecting member 12 abuts against the leg-side connecting member 31. For example, the seat frame 11 and the seat-side connecting member 12 are integrally formed from the same member (e.g., a resin member).

[0020] [Upholstery] The upholstery 10 is in the form of a stretchable (elastically deformable) sheet. The outer periphery of the upholstery 10 is supported by the seat frame 11 in a state in which the upholstery 10 is pulled in the front-to-back and left-to-right directions. The portion of the upholstery 10 inside the seat frame 11 (seating surface 10a) is elastically deformable in the up-and-down direction.

[0021] For example, the upholstery 10 is made of a mesh material and is stretchable. As shown in Figure 14, the peripheral edge 10b of the upholstery 10 is formed in a bag shape. An edging material 14 is inserted inside the peripheral edge 10b of the upholstery 10 and sewn in place. The edging material 14 is formed in the shape of a long, thin plate made of elastic synthetic resin. The upholstery 10 extends outward in the left-right direction, and the peripheral edge 10b is folded downward at the engaging claws 20. The peripheral edge 10b folded downward at the engaging claws 20 extends inward in the left-right direction and is inserted into the engaging groove 15a, where it engages.

[0022] [Seat frame] 4, the seat frame 11 includes a pair of rod members 15 spaced apart in the left-right direction and a pair of horizontal rods 16A, 16B spaced apart in the front-rear direction. Mounting portions 17 to which groove-forming members 70 are attached are formed at the corners of the seat frame 11 (see FIG. 9).

[0023] The attached portion 17 is recessed at the corner of the seat frame 11 so as to be lower than the upper surface of the engaging claw 20 (see FIG. 12). As shown in FIG. 12, the attached portion 17 has substantially the same height as the installation surface of the supported portion 13 (the lower end position of the supported portion 13). The attached portion 17 has female threaded portions 18A to 18C (see FIG. 9) into which a bolt 73 (fastening member, see FIG. 13) can be screwed. As shown in FIG. 9, a plurality of the female threaded portions 18A to 18C (for example, three in this embodiment) are arranged at intervals in the front-rear direction. Each of the female threaded portions 18A to 18C opens upward.

[0024] As shown in Figure 4, the rods 15 extend in the front-to-rear direction. The pair of left and right rods 15 are connected to each other by a seat-side connecting member 12. The left and right ends of the upholstery 10 (see Figure 1) are supported by the pair of left and right rods 15. The ends of the upholstery 10 in a stretched state are supported by the rods 15 so that they cannot fall off, and thus the upholstery 10 is stretched between the pair of rods 15 (see Figure 14). The horizontal rods 16A, 16B extend in the left-right direction. The pair of front and rear horizontal rods 16A, 16B includes a first horizontal rod 16A that connects the front ends of the pair of left and right rods 15, and a second horizontal rod 16B (extending in the width direction) that connects the rear ends of the pair of left and right rods 15. The pair of front and rear horizontal rods 16A, 16B support the front-rear ends of the upholstery 10 (see FIG. 1).

[0025] As shown in FIG. 10, the rod 15 has an engagement groove (hereinafter also referred to as the "first engagement groove 15a") that opens outward in the left-right direction so that the upholstery 10 can be engaged therewith. As shown in FIG. 3, the first engagement groove 15a is formed in the direction in which the rod 15 extends. The first engagement groove 15a is formed over the entire range in which the peripheral edge 10b of the upholstery 10 is arranged along the front-to-back direction (the direction in which the rod 15 extends). The first engagement groove 15a opens outward in the left-to-right direction in a range that does not overlap with the supported portion 13 when viewed from the left-to-right direction. In other words, the rod 15 does not have a first engagement groove 15a in the part that overlaps with the supported portion 13 when viewed from the left-to-right direction.

[0026] 10, the rod 15 has an engaging claw 20 that engages with the end of the upholstery 10, and a reinforcing portion 21 that has a larger cross-sectional area than the engaging claw 20 in a cross-sectional view perpendicular to the extension direction of the rod 15. For example, the engaging claw 20 and the reinforcing portion 21 are integrally formed from the same member (for example, a resin member).

[0027] [Engaging claws] The engagement claws 20 protrude outward in the left-right direction so as to apply tension to the upholstery 10 in that direction (see FIG. 14). The engagement claws 20 include a standing portion 20a that rises upward from the top surface of the reinforcing portion 21, and a protruding portion 20b that protrudes outward in the left-right direction from the upper end of the standing portion 20a. In a cross-sectional view taken along the extension direction of the rod 15, the upper surface of the protruding portion 20b is inclined so that it is positioned lower as it moves inward in the left-right direction. For example, as shown in FIG. 14, the engagement claws 20 undergo elastic deformation in the direction of the arrow due to the tension exerted inward in the left-right direction on the upholstery 10.

[0028] [Reinforcement] The reinforcing portion 21 is connected to the end portion opposite the protruding end of the engaging claw 20. The reinforcing portion 21 is connected to the lower end portion of the standing portion 20a of the engaging claw 20. The left-right length of the reinforcing portion 21 is greater than the left-right length of the engaging claw 20 when viewed in cross section in the direction in which the rod 15 extends. The up-down length of the reinforcing portion 21 is greater than the up-down length of the engaging claw 20 when viewed in cross section in the direction in which the rod 15 extends.

[0029] The outer left-right ends of the upper surface of the reinforcing portion 21 are located outside the protruding ends of the engaging claws 20. The left-right side surfaces of the reinforcing portion 21 are inclined so as to be positioned inward in the left-right direction as they extend downward in a cross-sectional view.

[0030] The reinforcing portion 21 comprises a thick portion 22 having a thickness greater than that of the engaging claw 20 in the vertical direction, a plate-shaped portion 23 having a thickness smaller than that of the thick portion 22 in the vertical direction, and ribs 24A, 24B protruding upward from the plate-shaped portion 23. The thick portion 22 constitutes the outer portion of the reinforcing portion 21 in the left-right direction. The plate-like portion 23 extends inward in the left-right direction from the lower end of the thick portion 22.

[0031] The ribs 24A, 24B are a first rib 24A having a thickness in the left-right direction and a second rib 24B having a thickness in the front-rear direction. The thicknesses of the first rib 24A and the second rib 24B are preferably approximately the same as the thickness of the plate-like portion 23.

[0032] The first rib 24A stands upward from the center in the left-right direction of the plate-shaped portion 23. The first rib 24A is formed along the extension direction of the rod 15. The height of the first rib 24A is approximately the same along the extension direction of the rod 15. The second rib 24B is formed between the thick portion 22 and the first rib 24A. The second ribs 24B are arranged at intervals in the direction in which the rod 15 extends. The heights of the second ribs 24B are all approximately the same. Recesses 25 are formed in the upper part of the second rib 24B, and are recessed to correspond to the downward protrusions 53A, 53B of the inner circumferential cover 50.

[0033] [Supported part] As shown in FIG. 12, the supported portion 13 protrudes from the rod 15 toward the seat support portion 37. The supported portion 13 is provided at a corner of the seat frame 11 (see FIG. 9). The supported portion 13 is provided at the connection between the pair of left and right rods 15 and the second horizontal rod 16B (see FIG. 4). The supported portion 13 stands upright when the seat 2 is in use. In the side view of FIG. 3, the length of the supported portion 13 in the front-to-rear direction gradually increases toward the bottom. In the top view of FIG. 9, the length of the supported portion 13 in the left-to-right direction gradually increases toward the rear. The supported portion 13 has an insertion hole 13a that opens outward in the left-to-right direction so that the shaft 9 can be inserted therethrough (see FIG. 12).

[0034] 12, the supported portion 13 has an engaging recess 13b that opens inward in the left-right direction so as to be able to engage with the engaging protrusion 63 of the arm cover 60. The engaging recess 13b is recessed outward in the left-right direction from the lower part of the inner surface of the supported portion 13 in the left-right direction. The inner surface of the supported portion 13 in the left-right direction (the portion above the engaging recess 13b) is inclined so as to be positioned inward in the left-right direction as it goes downward.

[0035] [Inner cover] As shown in FIG. 10 , the inner periphery cover 50 is detachably attached to the seat frame 11. In the top view of FIG. 4 , the inner periphery cover 50 is frame-shaped and conforms to the inner periphery of the seat frame 11. The inner periphery cover 50 is disposed inside the rod 15 in the left-right direction. As shown in FIG. 10 , the inner periphery cover 50 covers the reinforcing portion 21 of the rod 15 from the inside and from above in the left-right direction. The inner periphery cover 50 covers the rod 15 so that the ribs 24A, 24B of the reinforcing portion 21 are not exposed to the outside. The inner periphery cover 50 has an outer surface 50f that is continuous with the upper surface of the rod 15 (engagement claws 20). In the cross-sectional view of FIG. 10 , the outer surface 50f of the inner periphery cover 50 is inclined so as to be positioned lower as it moves inward in the left-right direction.

[0036] The inner circumferential cover 50 includes a first cover portion 51 having a thickness in the up-down direction, a second cover portion 52 having a thickness in the left-right direction, and downward protrusions 53A and 53B protruding downward from the first cover portion 51. For example, the first cover portion 51, the second cover portion 52, and the downward protrusions 53A and 53B are integrally formed from the same member (for example, a resin member).

[0037] The first cover portion 51 forms the upper surface of the inner circumferential cover 50. The upper surface of the first cover portion 51 is continuous with the upper surface of the engagement claw 20. The first cover portion 51 is inclined so as to be positioned lower as it moves inward in the left-right direction in a cross-sectional view. The second cover portion 52 forms the inner surface in the left-right direction of the inner circumferential cover 50. The second cover portion 52 protrudes downward from the inner end in the left-right direction of the first cover portion 51 toward the inner end in the left-right direction of the plate-shaped portion 23.

[0038] The pair of downward protrusions 53A, 53B are arranged with a gap in the left-right direction. The pair of downward protrusions 53A, 53B includes a first protrusion 53A that protrudes downward from an outer end of the first cover part 51 in the left-right direction, and a second protrusion 53B that protrudes downward from an inner end of the first cover part 51 in the left-right direction.

[0039] The first protruding portion 53A has a thickness in the left-right direction. The first protruding portion 53A is formed in the extension direction of the rod 15. The protruding height of the first protruding portion 53A is set to be approximately the same height in the extension direction of the rod 15. The second protrusion 53B is positioned further inward in the left-right direction than the first rib 24A. Multiple second protrusions 53B are arranged at intervals in the extension direction of the rod 15. The protrusion height of the second protrusions 53B is greater than the protrusion height of the first protrusion 53A. The second protrusion 53B has a recess 54 with which the protrusion 19 of the rod 15 can engage.

[0040] [Arm covers] As shown in FIG. 12, the arm cover 60 is detachably attached to the supported portion 13. The arm cover 60 covers the supported portion 13 so as not to overlap with the insertion hole 13a of the shaft 9. The arm cover 60 includes a first cover portion 61 that continues from the front surface of the supported portion 13 to the rear surface of the supported portion 13, and a second cover portion 62 that covers the supported portion 13 from the inside in the left-right direction (see FIG. 7). For example, the first cover portion 61 and the second cover portion 62 are integrally formed from the same member (for example, a resin member).

[0041] As shown in FIG. 3 , the front part of the first cover part 61 covers the supported part 13 from the front. The front lower end of the first cover part 61 is located near the center of the supported part 13 in the up-down direction. The rear part of the first cover part 61 covers the supported part 13 from the rear. The rear lower end of the first cover part 61 is located lower than the front lower end of the first cover part 61. The rear lower end of the first cover part 61 is located near the lower end of the supported part 13.

[0042] As shown in Fig. 12, the second cover part 62 is connected to the inner end in the left-right direction of the first cover part 61. The second cover part 62 has a thickness in the left-right direction. In the top view of Fig. 7, the second cover part 62 is inclined so as to be positioned inward in the left-right direction as it extends toward the rear.

[0043] 12, the second cover portion 62 has an engaging protrusion 63 that can engage with the engaging recess 13b of the supported portion 13. The engaging protrusion 63 protrudes outward in the left-right direction from a lower portion of the outer surface (back surface) in the left-right direction of the second cover portion 62. The protruding height of the engaging protrusion 63 in the left-right direction is smaller than the distance W1 between the second cover 62 portion and the groove forming member 70.

[0044] [Groove forming member] As shown in FIG. 4, the groove forming member 70 is attached to the rod 15 at a location facing the supported portion 13. The groove forming member 70 is disposed inward in the left-right direction from the supported portion 13. As shown in FIG. 3, the groove forming member 70 forms a second engagement groove 70a that is continuous with the first engagement groove 15a together with the upper surface of the attached portion 17 (see FIG. 11). The second engagement groove 70a is provided inward in the left-right direction from the supported portion 13 in a range that includes a range that overlaps with the supported portion 13 when viewed from the left-right direction, and is continuous with the first engagement groove 15a (see FIG. 3).

[0045] 8, a gap S1 that is equal to or greater than the thickness of the upholstery 10 is formed between the supported portion 13 and the groove forming member 70. For example, the size of the gap S1 is set to be equal to or greater than the thickness of the peripheral portion 10b of the upholstery 10 (including the edging material 14 sewn to the inside of the peripheral portion 10b, see FIG. 14).

[0046] 7, the groove forming member 70 is provided across the rear end of the rod 15, the connecting portion between the rod 15 and the second horizontal rod 16B, and the left and right ends of the second horizontal rod 16B. The groove forming member 70 extends across the rear end of the rod 15 and the left and right ends of the second horizontal rod 16B, sandwiching the connecting portion between the rod 15 and the second horizontal rod 16B. The groove forming member 70 has an outer surface 70f that is continuous with the rod 15, the second horizontal rod 16B, and the upper surface of the inner cover 50.

[0047] As shown in FIG. 11, the groove-forming member 70 has an engagement flange 71 that engages with the end of the upholstery 10. The engagement flange 71 protrudes outward in the left-right direction so as to apply tension to the upholstery 10 in that direction. The engagement flange 71 is continuous with the engagement claws 20 in the front-rear direction (see FIG. 3). A second engagement groove 70a that is continuous with the first engagement groove 15a is formed by the underside of the engagement flange 71 and the upper surface of the attached portion 17. In the cross-sectional view of FIG. 11, the upper surface of the engagement flange 71 is inclined so that it is positioned lower as it moves inward in the left-right direction.

[0048] 13, the groove forming member 70 is fixed to the rear end of the rod 15, the connecting portion between the rod 15 and the second horizontal rod 16B, and the left and right ends of the second horizontal rod 16B with bolts 73. The groove forming member 70 has a plurality of (for example, three in this embodiment) insertion holes 72A to 72C for inserting the shafts of the bolts 73 (see FIG. 7).

[0049] 7, the three insertion holes 72A to 72C are open in the same direction. The insertion holes 72A to 72C are open in the vertical direction on the upper surface of the groove forming member 70. The three insertion holes 72A to 72C are arranged at approximately equal intervals in the front-rear direction (the direction in which the groove forming member 70 extends).

[0050] For example, after the inner periphery cover 50 is attached to the seat frame 11, the groove forming member 70 is placed on the attachment portion 17. Thereafter, the shanks of the bolts 73 are inserted into the insertion holes 13a of the groove forming member 70 and screwed into the female thread portions 18A to 18C (see FIG. 9) of the attachment portion 17. In this way, the groove forming member 70 can be attached to the attachment portion 17.

[0051] [Support structure] As shown in FIG. 1, the support structure 3 includes a pair of left and right leg components 30, and a leg-side connecting member 31 that connects the pair of left and right leg components 30 together. The leg component 30 comprises a front leg portion 35, a rear leg portion 36 located behind the front leg portion 35, a seat support portion 37 that pivotally supports both the left and right rear portions of the seat 2, and a back support portion 38 that supports both the left and right ends of the backrest 4.

[0052] In the side view of FIG. 3, the front legs 35 extend at an angle so as to be positioned forward as they extend downward. The rear legs 36 extend at an angle so as to be positioned further rearward as they extend downward. The rear ends of the front legs 35 are connected to the rear legs 36 near the center in the vertical direction. Casters 39 are attached to the lower ends of the front legs 35 and rear legs 36.

[0053] The seat support portion 37 is provided above the position where the rear legs 36 are connected to the front legs 35. The seat support portion 37 extends forward from the rear legs 36. 1, the back support portion 38 extends upward from the upper end of the rear leg portion 36. The back support portion 38 is inserted into openings (not shown) at both the left and right ends of the backrest 4. The back support portion 38, together with the armrests 5, is screwed to the backrest 4 from the side.

[0054] [Action and effect] As explained above, the chair 1 according to the embodiment includes a seat 2 having an elastically deformable sheet-like upholstery 10 having a seating surface 10a on which a seated person can sit, a pair of rods 15 spaced apart in the left-right direction and on which the upholstery 10 is installed, and a support structure 3 having a pair of seat support parts 37 spaced apart in the left-right direction and supporting the seat 2 so that it can rotate around an axis 9 along the left-right direction, and the seat 2 projects from the rods 15 toward the seat support parts 37 and is supported so that it can rotate around the axis 9. The rod 15 has a supported portion 13 that is engaged with the upholstery 10, and the rod 15 has a first engagement groove 15a that opens outward in the left-right direction within a range that does not overlap with the supported portion 13 when viewed from the left-right direction so that the upholstery 10 can be engaged with it. The seat 2 has a groove forming member 70 that is attached to a portion of the rod 15 that faces the supported portion 13, and is provided on the inside in the left-right direction of the supported portion 13 within a range that includes a range that overlaps with the supported portion 13 when viewed from the left-right direction, and has a second engagement groove 70a that is continuous with the first engagement groove 15a.

[0055] According to this configuration, first engagement groove 15a opens in a range that does not overlap with supported portion 13 when viewed from the left and right, so that supported portion 13 is not positioned in the direction in which the mold used to open first engagement groove 15a is removed. Therefore, by sliding the mold in the same direction, supported portion 13 and first engagement groove 15a can be molded at the same time using the same mold. This makes it easy to mold the seat. In addition, the groove forming member 70 attached to the rod 15 forms a second engagement groove 70a that is continuous with the first engagement groove 15a, so that the peripheral portion 10b of the upholstery 10 can be engaged along the first engagement groove 15a and the second engagement groove 70a, allowing the upholstery 10 to be quickly tensioned.

[0056] In the above embodiment, a gap S1 that is equal to or greater than the thickness of the upholstery 10 is formed between the supported portion 13 and the groove forming member 70. According to this configuration, the gap S1 between the supported portion 13 and the groove forming member 70 can be used as a working space when engaging the peripheral portion 10b of the upholstery 10 with the second engagement groove 70a, thereby allowing the upholstery 10 to be quickly tensioned.

[0057] In the above embodiment, the rod material 15 extends in a direction perpendicular to the left-right direction, and the seat 2 has a second horizontal rod 16B that extends in the left-right direction and connects the ends of a pair of rod materials 15 on the side of the seat support portion 37 in the direction in which the rod materials 15 extend, and the supported portion 13 is provided at the connection portion between the rod material 15 and the second horizontal rod 16B. According to this configuration, the supported portion 13 is required to have a high rigidity due to its function of being supported so that it can rotate around the axis 9 along the left-right direction. However, by providing the supported portion 13 at the connection between the rod material 15 and the second horizontal rod 16B, the rigidity of the supported portion 13 can be ensured.

[0058] In the above embodiment, the groove forming member 70 is provided across the end of the rod 15 on the seat support portion 37 side, the connecting portion between the rod 15 and the second horizontal rod 16B, and the left and right ends of the second horizontal rod 16B. According to this configuration, the connection between the rod material 15 and the second horizontal rod 16B is provided with a supported portion 13, and therefore great rigidity is required around the connection portion. However, by providing the groove forming member 70 over the end of the rod material 15 on the seat support portion 37 side, the connection portion, and the left and right ends of the second horizontal rod 16B, the rigidity of the surrounding area of ​​the connection portion can be ensured.

[0059] In the above embodiment, the groove forming member 70 is fixed with bolts 73 to the end of the rod material 15 on the seat support portion 37 side, the connection portion between the rod material 15 and the second horizontal rod 16B, and the left and right ends of the second horizontal rod 16B. According to this configuration, the groove forming member 70 can be firmly fixed.

[0060] In the above embodiment, the groove forming member 70 has a plurality of insertion holes 72A to 72C for inserting the bolts 73, and the plurality of insertion holes 72A to 72C are open in the same direction. According to this configuration, by sliding the mold in the same direction, the multiple insertion holes 72A to 72C can be molded at once using the same mold, and therefore the groove forming member 70 can be easily molded.

[0061] In the above embodiment, the seat 2 is provided with an inner cover 50 that covers the rod material 15 and the second horizontal rod 16B from the side of the seating surface 10a, and the groove forming member 70 has an outer surface 70f that is continuous with the surfaces of the rod material 15, the second horizontal rod 16B and the inner cover 50 on the side of the seating surface 10a. According to this configuration, when the peripheral edge 10b of the upholstery 10 is engaged with the second engagement groove 70a, the upholstery 10 can be pulled along the outer surface 70f of the groove forming member 70, allowing the upholstery 10 to be quickly tensioned.

[0062] [Variations] While the preferred embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the above-described embodiments. The shapes and combinations of the components shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0063] In the above embodiment, the chair 1 is placed on a horizontal surface, but this is not limiting. For example, the chair may be placed on a vertical surface or an inclined surface that is inclined relative to the horizontal surface.

[0064] In the above embodiment, the rods 15 extend in a direction perpendicular to the left-right direction, the seat 2 includes a second horizontal rod 16B that connects the ends of the pair of rods 15 on the seat support portion 37 side in the extension direction of the rods 15 and extends in the left-right direction, and the supported portion 13 is provided at the connecting portion between the rods 15 and the second horizontal rod 16B. However, this is not limited to this. For example, the rods 15 may extend in a direction that diagonally intersects with the left-right direction. For example, the supported portion 13 may be provided only in a portion of the extension direction of the rods 15. For example, the supported portion 13 may be provided only in a portion of the extension direction of the second horizontal rod 16B.

[0065] In the above embodiment, an example has been described in which the groove forming member 70 is provided at the end of the rod 15 on the seat support portion 37 side, at the connecting portion between the rod 15 and the second horizontal rod 16B, and across the left and right ends of the second horizontal rod 16B, but this is not limiting. For example, the groove forming member 70 may be provided only at the connecting portion between the rod 15 and the second horizontal rod 16B. For example, the groove forming member 70 may be provided at a portion of the rod 15 that faces the supported portion 13.

[0066] In the above embodiment, an example has been described in which the groove forming member 70 is fixed by bolts 73 to the end of the rod 15 on the seat support portion 37 side, the connecting portion between the rod 15 and the second horizontal rod 16B, and the left and right ends of the second horizontal rod 16B, but this is not limited to this. For example, the groove forming member 70 is not limited to being fixed by multiple bolts 73, and may be fixed by a single bolt 73. For example, the groove forming member 70 may be fixed by a fixing member other than the bolt 73.

[0067] In the above embodiment, an example has been described in which the groove forming member 70 has a plurality of insertion holes 72A to 72C for inserting the bolts 73, and the plurality of insertion holes 72A to 72C are each open in the same direction, but this is not limiting. For example, the plurality of insertion holes 72A to 72C may each be open in different directions.

[0068] In the above embodiment, the seat 2 includes the inner circumferential cover 50 that covers the rod 15 and the second horizontal rod 16B from the side of the seating surface 10a, and the groove forming member 70 has the outer surface 70f that is continuous with the surfaces of the rod 15, the second horizontal rod 16B, and the inner circumferential cover 50 that face the seating surface 10a. However, this is not limiting. For example, the seat 2 may not have the inner circumferential cover 50. For example, the outer surface 70f of the groove forming member 70 may not be continuous with the surfaces of the rod 15, the second horizontal rod 16B, and the inner circumferential cover 50 that face the seating surface 10a. [Explanation of symbols]

[0069] 1...chair, 2...seat, 3...support structure, 9...axis, 10...upholstery (seat surface component), 10a...seating surface, 13...supported portion, 15...rod material, 15a...first engaging groove, 16B...second horizontal rod (widthwise extending portion), 37...seat support portion, 50...inner periphery cover (cover), 70...groove forming member, 70f...outer surface of groove forming member, 70a...second engaging groove, 72A to 72C...insertion hole, 73...bolt (fastening member), S1...gap

Claims

1. a seat having an elastically deformable sheet-like seating surface component having a seating surface on which a seated person can sit, and a rectangular seat frame formed by connecting a plurality of rods together, with the seating surface component being stretched inside; a support structure having a seat support portion that supports the seat so that it can rotate around an axis along the width direction of the chair, The seat includes a supported portion that protrudes from the seat frame toward the seat support portion and is supported rotatably around the axis, The rod member has a first engagement groove that opens to the outside, which is the opposite direction to the inside of the seat frame, within a range that does not overlap with the supported portion so as to be able to engage with the seat surface constituent member, The chair is characterized in that the seat is attached to a portion of the seat frame facing the supported portion, and is provided with a groove-forming member that is located on the inside of the supported portion in an area that includes an area that overlaps with the supported portion and has a second engagement groove that is continuous with the first engagement groove.

2. 2. The chair according to claim 1, wherein a gap greater than or equal to the thickness of the seat surface constituent member is formed between the supported portion and the groove forming member.

3. 3. The chair according to claim 1, wherein the groove forming member is fixed to one of the plurality of rods that faces the supported portion by a fastening member.

4. A mounting portion to which the groove forming member is attached is formed at a corner of the seat frame, 4. The chair according to claim 3, wherein the mounting portion is formed with a female thread portion into which the fastening member can be screwed.

5. A chair as described in Claim 4, characterized in that the female threaded portion opens upward.

6. the groove forming member has an insertion hole for inserting the fastening member, The chair according to claim 3, characterized in that the groove forming member is provided with an engagement flange located outside the insertion hole in the groove forming member and forming the second engagement groove between itself and the upper surface of the rod.

7. A chair as described in Claim 6, characterized in that the insertion hole is formed in a portion of the groove forming member that extends inward from the inner end of the portion where the engagement flange is formed so as to be positioned lower.

8. A chair as described in claim 1, further comprising a seat-side connecting member that connects a pair of opposing rods among the plurality of rods in a direction intersecting the longitudinal direction of the rods.

9. A chair as described in Claim 8, characterized in that the supported portion and the groove forming member are arranged in a position on the seat frame spaced apart in the fore-and-aft direction from the seat side connecting member.

10. A chair as described in Claim 9, characterized in that the supported portion and the groove forming member are arranged behind the seat side connecting member in the seat frame.

11. Further provided with a leg-side connecting member that connects the pair of leg constituent members together, 11. The chair according to claim 10, wherein the seat-side connecting member abuts against the leg-side connecting member when the seat is in use.

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