sofa

Abstract

To solve the problem that it is difficult to support a fluid use mode of furniture that occurs when supporting a new way of working in a sofa suitably used in an office or the like.SOLUTION: In a sofa S supporting a sofa body 2 on a frame 1, the frame 1 includes a seat support part 3 having a front leg 31 and left and right rear legs 32 and a back support part 4 extending upward from the rear legs 32. A back surface frame part F composed of the rear legs 32 and the back support part 4 is configured to be inclined forward to locate bottom edges 32a of the rear legs 32 at a rearmost position.SELECTED DRAWING: Figure 3

Description

Technical Field

[0007] ,

[0001] The present invention relates to a sofa suitably used in an office or the like.

Background Art

[0002] Conventional sofas are generally installed in a reception room or the like in a stable state with a heavy appearance (see, for example, Patent Document 1).

[0003] However, in recent offices and the like, various work style reforms are in progress, and a fluid usage mode of furniture is sometimes emphasized, such as forming a team each time and quickly setting up a meeting area in an appropriate place.

[0004] Under such circumstances, for sofas as well, there are times when it is desirable to be able to appropriately change the installation location, orientation, etc., but conventional sofas are heavy and difficult to move or change their posture, and there are many that cannot meet the above-mentioned demands.

[0005] In particular, in conventional sofas, the backrest is tilted backward and the upper edge of the backrest is located at the rearmost position. Therefore, when the backrest is placed against a building wall for installation or arranged back-to-back, it is difficult to reach the upper end of the backrest during the moving operation, and the rearrangement work takes time and is likely to damage the wall or the backrest.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] An object of the present invention is to solve the above-mentioned conventional problems that occur when trying to adapt to a new work style. [Means for solving the problem]

[0008] The sofa according to claim 1 is a sofa in which the sofa body is supported on a frame, wherein the frame comprises a seat support portion having front legs and left and right rear legs, and a back support portion extending upward from the rear legs, and the back frame portion consisting of the rear legs and the back support portion is tilted forward such that the lower ends of the rear legs are located at the rearmost position. The back support portion comprises left and right back support rods extending upward from the upper ends of the left and right rear legs, and a horizontal member installed between the upper ends of these back support rods, the horizontal member is curved such that its central part in the left-right direction is located behind both left and right ends, the sofa body comprises a seat mounted on the seat support portion and a backrest disposed on the rear edge side of the seat portion, a gap is formed between the back of the backrest and the horizontal member of the frame to allow elastic deformation of the backrest toward the rear, the horizontal member begins to curve from both left and right ends, the lower edge of the backrest is fixed to the seat portion, the upper edge is elastically deformable in the front-rear direction and is in contact with both left and right ends of the horizontal member It is.

[0010] Claim 2 The sofa according to the described invention is characterized in that the back frame portion is tilted forward such that the left-right central portion of the horizontal member is positioned forward with respect to a virtual vertical plane set at the lower rear edge of both rear legs. 1 It is as described.

[0012] Claim 3 The sofa according to the described invention is characterized in that the backrest is detachably attached to the seat by its lower edge via a linear fastener. 1 It is as described.

[0013] Claim 4 The sofa according to the invention described herein is as described in claim 1, wherein the seat portion comprises a hollow frame body that allows access to the internal space from the outside, and an exterior material that covers the outside of the frame body, the frame has a connecting rod inserted into the frame body, and the connecting rod is fastened to the frame body by a fastener inserted into the internal space from the outside.

[0014] Claim 5 The sofa according to the invention described herein is as described in claim 1, wherein the seat portion comprises a frame whose horizontal cross-section near the lower end gradually narrows toward the lower end, and an exterior material covering the outside of the frame, and the exterior material is provided with a fastener for changing the horizontal cross-section near the lower end.

[0015] Claim 6 The sofa according to the invention described, wherein the front legs are provided with casters, and the movable range of the casters is set to be within the inner side of the outer edge of the seat portion in plan view. Claim 1 as described above.

[0017] Here, in the present invention, "tilting the rear frame portion forward" is a concept indicating the entire state in which the rear legs stand while tilting from the rear lower side to the front upper side.

Effect of the Invention

[0018] According to the present invention, since the rear frame portion of the frame is tilted forward, it becomes easy to move by putting a hand on the upper end of the rear frame portion, and it is also possible to suppress the problem of scratching the wall or other sofas. That is, it becomes easy to cope with the fluid usage mode of furniture that occurs when trying to cope with a new working method. Moreover, since the sofa body is supported on the frame, if casters are provided on the frame, the mobility is enhanced and it also becomes easy to grip and move the frame.

Brief Description of the Drawings

[0019] [Figure 1] An overall perspective view showing a sofa according to an embodiment of the present invention. [Figure 2] A front view showing the sofa according to the embodiment. [Figure 3] A left side view showing the sofa according to the embodiment. [Figure 4] A rear view showing the sofa according to the embodiment. [Figure 5] A plan view showing the sofa according to the embodiment. [Figure 6] A bottom view showing the sofa according to the embodiment. [Figure 7] A cross-sectional view taken along line A-A in FIG. 2. [Figure 8] A central side cross-sectional view showing the exterior material of the sofa according to the embodiment. [Figure 9] An exploded perspective view showing a sofa according to the same embodiment. [Figure 10] A perspective view from the bottom side showing the seat portion of the sofa according to the same embodiment. [Figure 11] Cross-sectional view along line XX in Figure 7. [Figure 12] A front view showing a sofa according to another embodiment of the present invention. [Figure 13] Left side view showing a sofa according to the same embodiment. [Figure 14] A rear view showing the sofa according to the same embodiment. [Figure 15] A plan view showing a sofa according to the same embodiment. [Modes for carrying out the invention]

[0020] One embodiment of the present invention will be described below with reference to Figures 1 to 11.

[0021] This embodiment shows the application of the present invention to a single-seater sofa S.

[0022] As shown in Figures 1 to 7 and Figure 9, this sofa S has a sofa body 2 supported on a frame 1. The frame 1 includes a seat support section 3 having front legs 31 and left and right rear legs 32, and a back support section 4 extending upward from the rear legs 32. The back frame section F, consisting of the rear legs 32 and the back support section 4, is tilted forward so that the lower end 32a of the rear legs 32 is located at the rearmost position.

[0023] More specifically, the seat support section 3 of frame 1, as shown in Figures 1 to 3, 6, 7, and 9, comprises left and right vertical frame members 33, a horizontal frame member 35 installed between the front ends of these vertical frame members 33 via left and right connecting frame members 34, and a pair of intermediate frame members 36 arranged parallel to the horizontal frame member 35 and connecting the left and right vertical frame members 33. Front legs 31 hang down from the middle portions of the left and right connecting frame members 34, and rear legs 32 extend downward from the rear ends of the left and right vertical frame members 33. Casters 37 are provided at the lower ends of the left and right front legs 31. The left and right rear legs 32 are inclined to gradually shift backward toward the rear, and a ground contact body 38 with an anti-slip function is provided at the lower end 32a of each of these rear legs 32. The vertical frame members 33, horizontal frame members 35, connecting frame members 34, front legs 31, and rear legs 32 are each made of metal pipe material or the like, and the intermediate frame member 36 is made of metal strip or the like. The front and rear intermediate frame members 36 are provided with bolt insertion holes 36a, and the sofa body 2 can be fastened onto the seat support portion 3 of the frame 1 by screwing mounting bolts v1, which are inserted from below into these bolt insertion holes 36a, onto the underside of the sofa body 2.

[0024] As shown in Figures 1, 3-5, 7, and 9, the back support section 4 of frame 1 comprises left and right back support rods 41 extending upward from the upper ends 32b of the left and right rear legs 32, and a horizontal member 43 installed between the upper ends of these back support rods 41 via a connecting frame member 42. The horizontal member 43 is curved so that its left-right central portion 43a is located behind both left and right end portions 43b. The back frame section F is tilted forward so that the left-right central portion 43a of the horizontal member 43 is located in front of a virtual vertical plane P set at the rear edge of the lower end 32a of both rear legs 32. The back support rods 41, the horizontal member 43, and the connecting frame member 42 are each made of metal pipe material or the like, and in this embodiment, the left and right back support rods 41 and the left and right rear legs 32 are integrally formed from a common pipe material. The seat portion 5 of the sofa body 2, as will be described later, comprises a hollow frame 51 that allows access to the internal space SP from the outside, and an exterior material 52 that covers the outside of this frame 51. The frame 1 has a connecting rod 44 that is inserted into the frame 51. The connecting rod 44 is a plate-shaped object that extends forward from the middle portion of the back support rod 41, and as will be described later, it is fastened to the frame 51 by a bolt v2, which is a fastener inserted into the internal space SP from the outside.

[0025] As shown in Figures 1 to 5, 7 and 9, the sofa body 2 comprises a seat 5 mounted on the seat support portion 3 of the frame 1, and a backrest 6 positioned on the rear edge side of the seat 5. A gap ss is formed between the back of the backrest 6 and the horizontal member 43 of the frame 1 to allow elastic deformation of the backrest 6 toward the rear.

[0026] As shown in Figures 2, 4, and 7, the backrest 6 is detachably attached to the seat 5 via a linear fastener 63 at its lower edge, and its upper edge is elastically deformable in the front-rear direction.

[0027] As shown in Figures 7, 9, and 10, the seat portion 5 of the sofa body 2 comprises a frame 51 whose horizontal cross-section near the lower end gradually narrows towards the lower end, and an exterior material 52 that covers the outside of the frame 51. The exterior material 52 is equipped with a linear fastener 523 for changing the horizontal cross-section near the lower end.

[0028] As shown in Figures 7, 9, and 11, the frame 51 comprises a bottom plate 53, an intermediate plate 54 disposed above the bottom plate 53 via a lower support 56, and an upper plate 55 disposed above the rear end of the intermediate plate 54 via an upper support 57, and is constructed of, for example, wood. The bottom plate 53 is fitted between the left and right vertical frame members 33 in the seat support portion 3 of the frame 1 and placed on the intermediate frame member 36, and is fastened to the intermediate frame member 36 by screws attached from the bottom side. A lower opening 53a is formed in the central region of the bottom plate 53 located between the intermediate frame members 36, allowing the internal space SP formed within the frame 51 to communicate with the outside through this lower opening 53a. Lower support members 56 are erected at each of the four corners of the bottom plate 53, and the intermediate plate 54 is horizontally supported on these lower support members 56. Each lower support 56 is equipped with a pair of upright plates 561 that intersect at right angles and whose outer edges align with the outer edge of the exterior material 52, and horizontal ribs 562 that connect these upright plates 561. A virtual loop line horizontally connecting the outer edges of the upright plates 561 corresponds to the outer edge of the horizontal cross-section of the seat portion 5. A smoothly curved chamfered portion 561a is formed on the lower part of the outer edge of each upright plate 561 in the lower support 56, and the presence of this chamfered portion 561a causes the horizontal cross-section near the lower end of the frame 51 to gradually narrow towards the lower end.

[0029] As shown in Figures 7, 9, and 11, the intermediate plate 54 of the frame 51 is a flat plate having a width corresponding to the widest horizontal cross-section of the seat 5, and has an upper opening 54a at its rear end. Four upper supports 57 are erected on the upper surface of the intermediate plate 54 so as to surround the upper opening 54a, and the top plate 55 is supported on these upper supports 57. The upper supports 57 are prism-shaped and made of wood or the like. When combining the frame 1 and the sofa body 2, the connecting rod 44 of the frame 1 is inserted into the frame 51 through a connecting rod insertion opening 5x provided on the back of the sofa body 2, and the insertion end of the connecting rod 44 is in contact with the inner surface 57a of the two upper supports 57 located at the rear. Nuts 571 are embedded in the two upper support bodies 57 located at the rear, and bolts v2 screwed into these nuts 571 from the inside can fasten the connecting rod 44 of the frame 1 to the frame body 51. That is, the upper small space SP1 formed between the top plate 55 and the intermediate plate 54 of the frame body 51 and the lower small space SP2 formed between the intermediate plate 54 and the bottom plate 53 are in communication with each other through an upper opening 54a drilled in the intermediate plate 54. The internal space SP of the frame body 51, consisting of these upper small space SP1 and lower small space SP2, is in communication with the outside through a lower opening 53a made in the bottom plate 53. Therefore, by appropriately selecting the orientation of the sofa S, it becomes possible to access the insertion end of the connecting rod 44 inserted into the frame body 51 from the outside through the openings 53a and 54a, and the insertion end can be fixed to the nut 571 of the frame body 51 by a bolt v2 that passes through a bolt insertion hole 44a formed in the insertion end. Furthermore, 59 is a reinforcing member that supports the rear end of the upper plate 55.

[0030] As shown in Figures 8 and 10, the exterior material 52 comprises an exterior fabric 521 that is exposed to the outside and a cushion 522 attached to the inner surface of the exterior fabric 521. The seat portion 5 is formed by covering the outside of the frame 51 with this exterior material 52. The exterior material 52 is designed to be placed over the frame 51 from above, and when placed over, it is made to fit snugly to the outside of the frame 51. The lower ends of the four corners of the exterior material 52 are separated, and these separated lower ends of the four corners are joined together with wire fasteners 523 so that the lower ends of the four corners of the exterior material 52 also fit the shape of the frame 51.

[0031] As shown in Figure 7, the backrest 6 of the sofa body 2 is equipped with an elastically deformable core material 62 within the outer fabric 61, and the lower edge of the outer fabric 61 is detachably connected to the upper surface of the seat 5 via a linear fastener 63.

[0032] This sofa S is equipped with casters 37 on its front legs 31 that can swivel in all directions, and with anti-slip grounding bodies 38 on its rear legs 32. Therefore, in its normal grounded state, it is stably held in place by the function of the grounding bodies 38. When the rear end of the frame 1 is lifted by placing a hand on the horizontal member 43, the braking action of the grounding bodies 38 is eliminated, making it possible to move the sofa to any desired location using the casters 37. The range of motion of the casters 37 is set to fit inside the outer edge 5c of the seat portion 5 in a plan view, so that even if multiple sofas S are lined up closely together, the casters 37 do not interfere with each other. In this sofa S, the outer edge of the seat portion 5 of the sofa body 2 is located outside the frame 1, and the outer edge of the seat portion 5 is arranged with alternating circumferential surfaces 5a that curve with a large radius of curvature in a plan view and corner surfaces 5b that curve with a small radius of curvature that connect these circumferential surfaces 5a. Therefore, it is possible to arrange multiple sofas S in a straight line, or to arrange them in a gently curving manner even when they are close together, thus allowing for a wide variety of arrangement patterns.

[0033] Here, Figure 1 is an overall perspective view showing the sofa S of this embodiment. Figure 2 is a front view thereof. Figure 3 is a left side view thereof. Figure 4 is a rear view thereof. Figure 5 is a top view thereof. Figure 6 is a bottom view thereof. Figure 7 is a cross-sectional view along line AA in Figure 2, with the exterior material 52 of the seat 5 shown by dashed lines. Figure 8 is a cross-sectional view of the exterior material 52 of the seat 5 of the sofa S of this embodiment, cut at the location corresponding to line AA in Figure 2. In this figure, the parts of the sofa S other than the exterior material 52 of the seat 5 are shown by dashed lines. In Figures 7 and 8, the exterior fabric of the exterior material 52 of the seat 5 and the exterior fabric 61 of the backrest 6 are shown by thick lines. Figure 9 is an exploded perspective view showing the sofa S of this embodiment, with the exterior material 52 of the seat 5 shown by dashed lines. Figure 10 is a perspective view from the bottom side showing the seat 5 of this embodiment. Figure 11 is an enlarged view of the main part of the cross-section along line XX in Figure 7, with the exterior material 52 of the seat 5 omitted. In the figure, the linear fastener 63 for fastening the backrest 6 to the seat 5 and the linear fastener 523 for changing the horizontal cross-section near the lower end of the exterior material 52 are shown as lines.

[0034] With a sofa S of this configuration, the back frame portion F of frame 1 is tilted forward, making it easy to move by placing your hand on the upper end of the back frame portion F, and also reducing the risk of scratching walls or other sofas. Furthermore, since the sofa body 2 is supported on frame 1 and casters 37 are provided on frame 1, mobility is increased, and it becomes easy to move by gripping frame 1. In other words, it can easily accommodate the fluid usage patterns of furniture that arise when trying to adapt to new ways of working.

[0035] In other words, by tilting the rear frame portion F forward, when the sofa S is placed close to a vertical wall such as a building wall or partition wall, the lower end 32a of the rear leg 32 of the frame 1 will preferentially come into contact with the wall, while the other parts of the frame 1 will be spaced away from the wall. Therefore, it is possible to effectively prevent damage to the wall. Furthermore, with this configuration, a gap is formed between the horizontal member 43 located at the upper end of the rear frame portion F and the wall. Therefore, not only is it possible to prevent fingers from getting caught between the frame 1 and the wall when moving the sofa, but it also becomes easier to grab the horizontal member 43 of the sofa S when it is in place, allowing for smoother movement.

[0036] Furthermore, since the back support section 4 comprises left and right back support rods 41 extending upward from the upper ends 32b of the left and right rear legs 32, and a horizontal member 43 installed between the upper ends of these back support rods 41, it is easy to reduce the weight, and moreover, since the horizontal member 43 is curved so that the central part 43a in the left-right direction is located behind the left and right end parts 43b, it can effectively support and hold the backrest 6 of the sofa body 2.

[0037] In this embodiment in particular, the sofa body 2 comprises a seat 5 mounted on a seat support 3 and a backrest 6 disposed on the rear edge side of the seat 5. A gap ss is formed between the back of the backrest 6 and the horizontal member 43 of the frame 2 to allow elastic deformation of the backrest 6 toward the rear. This promotes the elastic deformation of the backrest 6, making the cushioning of the backrest 6 particularly good.

[0038] Furthermore, since the lower edge of the backrest 6 is detachably fastened to the seat 5 via a wire fastener 63, the backrest 6 can be easily removed from the seat 5 for replacement, cleaning, etc.

[0039] Furthermore, in this embodiment, the connecting rod 44 protruding from the back support rod 41 of the frame 2 is fastened to the frame 51 of the seat 5, thereby increasing the rigidity of the entire back frame portion F, which is advantageous when moving the seat. In this embodiment, the seat 5 is made up of a hollow frame 51 that allows access to the internal space from the outside, and an exterior material 52 that covers the outside of the frame 51. The frame 4 is made to have a connecting rod 44 inserted into the frame 51, and the connecting rod 44 is fastened to the frame 51 by a bolt v2, which is a fastener inserted into the internal space from the outside. As a result, not only can the frame 1 and the sofa body 2 be easily connected, but the connecting rod 44 and its fastening part can be completely concealed when in use. Therefore, the appearance can also be improved.

[0040] In this embodiment, the seat portion 5 comprises a frame 51 whose horizontal cross-section near the lower end gradually narrows towards the lower end, and an exterior material 52 that covers the outside of the frame 51. The exterior material 52 is equipped with a fastener 53 for changing the horizontal cross-section near the lower end. Therefore, when placing the exterior material 52 over the frame 51, the fastener 53 is opened (see dashed line in Figure 10), and when the exterior material 52 is completely covered over the frame 51, the fastener 53 is closed, causing the exterior material 52 to conform to the outer shape of the frame 51, and allowing the exterior material 52 to be attached to the outer surface of the frame without wrinkles.

[0041] Furthermore, this sofa S has front legs 31 equipped with casters 37, and the range of motion of the casters 37 is set to fit inside the outer edge 5c of the seat 5 in a plan view. Therefore, multiple sofas S can be arranged with the outer edges 5c of the seat 5 in close contact with each other without causing interference between the casters 37.

[0042] However, the present invention is not limited to the embodiments described above.

[0043] For example, the rear frame portion, which consists of the rear legs and the back support portion, is not limited to a straight shape as in the embodiment described above, but may also be curved, as long as the lower end of the rear legs is tilted forward so that it is positioned as far back as possible. Furthermore, the material of the rear frame portion is not limited to metal, but may be wood, resin, or the like.

[0044] Furthermore, the seat and backrest of the sofa body may be constructed as a single unit rather than the backrest being detachable from the seat, or the backrest may be detachably attached to the seat by means other than linear fasteners, such as hooks or hook-and-loop fasteners.

[0045] The method of attaching the sofa body to the frame is not limited to that of the above-described embodiment. However, if the attachment method is as described above, the part of the sofa body attached to the frame is not visible from the outside, thus resulting in a neater appearance.

[0047] In the embodiment described above, the front legs are equipped with casters and the rear legs are provided with ground contact surfaces that have an anti-slip function. However, casters may be provided on all of the front and rear legs.

[0048] Figures 12 to 15 The image shows a sofa as an example.In a sofa in which the sofa body 2 is supported on a frame F, the frame F may be configured such that the frame F comprises a seat support portion 3 having front legs 31 and left and right rear legs 32, and a horizontal member 30 connecting the upper ends of the rear legs 32, i.e., the vicinity of the upper ends 32b, and the rear frame portion F consisting of the rear legs 32 and the horizontal member 30 is tilted forward, and the sofa body 2 is provided with a seat portion 5 mounted on the seat support portion 3 of the frame F. In the figures, 30a is the central part of the horizontal member, and 30b is its end. Here, Figure 12 is a front view of sofa S2. Figure 13 is a left side view thereof. Figure 14 is a rear view thereof. Figure 15 is a top view thereof. This sofa S2 has a configuration similar to the sofa S of the embodiment described above with reference to Figures 1 to 11, except that it does not have a backrest and a back support portion of the frame, so the same reference numerals are used for parts corresponding to sofa S in the embodiment described above, and their explanations are omitted.

[0049] Even with this configuration, the forward-tilting back frame F makes it easier to move the sofa by placing your hand on the upper end of the back frame F, and also helps to prevent damage to walls or other sofas. Furthermore, because the forward-tilting back frame F allows for increased stability by ensuring sufficient distance between the front legs 31 and the rear legs 32, while also positioning the horizontal member 30 connecting the upper ends of the rear legs 32 slightly forward, or inward, to make the front-to-back dimensions of the sofa more compact. Moreover, the sofa S2 shown in Figures 12 to 15 is equipped with casters 37 on the frame F, increasing its mobility and making it easier to move the sofa by gripping the frame F. In other words, even with this configuration, it is possible to easily accommodate the fluid usage patterns of furniture that arise when trying to adapt to new ways of working.

[0050] Furthermore, various modifications are permitted as long as they do not impair the spirit of the present invention. [Explanation of symbols]

[0051] S, S0... sofa 1…frame 2…Sofa body 3...Seat support part 31...front leg 32... hind legs 32a...Lower end of the hind leg 4...Back support part 41...Dorsal rod 43, 30… Horizontal members 43a... Central part of the horizontal member 43b...End of horizontal structural member 44…Connecting rod 5... Seat area 51…Frame body 52…Exterior materials 5c... outer edge of the seat 6...backrest 63... Line fastener F...Rear frame part P...Virtual lead SP…(Internal space of the frame) ss...gap v2… Fasteners (bolts)

Claims

1. A sofa in which the sofa body is supported on a frame, The frame comprises a seat support section having front legs and left and right rear legs, and a back support section extending upward from the rear legs. The rear frame portion, which consists of the rear legs and the back support portion, is tilted forward so that the lower end of the rear legs is positioned as far back as possible. The aforementioned back support section comprises left and right back support rods extending upward from the upper ends of the left and right rear legs, respectively, and a horizontal member installed between the upper ends of these back support rods, wherein the horizontal member is curved such that its central portion in the left-right direction is located further back than both ends. The sofa body comprises a seat mounted on the seat support and a backrest disposed on the rear edge side of the seat, and a gap is formed between the back of the backrest and the horizontal member of the frame to allow elastic deformation of the backrest toward the rear. The aforementioned horizontal member begins to curve from both its left and right ends, The sofa is characterized in that the backrest has its lower edge fixed to the seat, its upper edge is elastically deformable in the front-to-back direction, and is in contact with the left and right ends of the horizontal member.

2. The sofa according to claim 1, wherein the rear frame portion is tilted forward such that the left-right central portion of the horizontal member is positioned forward with respect to a virtual vertical plane set at the lower rear edge of both rear legs.

3. The sofa according to claim 1, wherein the lower edge of the backrest is detachably fastened to the seat via a linear fastener.

4. The aforementioned seat comprises a hollow frame that allows access to the internal space from the outside, and an exterior material that covers the outside of this frame. The frame has a connecting rod that is inserted into the frame body, The sofa according to claim 1, wherein the connecting rod is fastened to the frame by a fastener inserted into the internal space from the outside.

5. The aforementioned seat portion comprises a frame whose horizontal cross-section near the lower end gradually narrows toward the lower end, and an exterior material that covers the outside of this frame. The sofa according to claim 1, wherein the exterior material is provided with a fastener for changing the horizontal cross-section near the lower end.

6. The sofa according to claim 1, wherein the front legs are equipped with casters, and the range of motion of the casters is set to be within the inner edge of the outer edge of the seat in a plan view.

Images