Sofa bed

Abstract

To provide a sofa bed which reduces resistance when bent and improves durability of cushions.SOLUTION: A sofa bed 1 includes: a cushion 2; a plurality of frames 3 forming a frame supporting the cushion 2; and a plurality of bent parts 4 connecting the frame 3 bendably in a longitudinal direction. The cushion 2 is divided into a first side and a second side with the frame 3 in between in a thickness direction; it is divided into a first cushion 21, a second cushion 22, a third cushion 23, a fourth cushion 24, and a fifth cushion 25 in order from one end part to the other end part in the longitudinal direction. At least one specific cushion of the cushion 2 is formed only on the first side and a second side is empty. The cushion 2 is bendable as the frame 3 bends in the bent parts 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a sofa bed that can be changed in shape by bending at a bending portion. [Background technology]

[0002] Conventionally, a sofa that can be used as a bed by bending at a bending portion has been proposed. For example, the sofa of Patent Document 1 is a simple bed-cum-sofa that is compact when used as a normal sofa, and is sufficiently long when used as a bed, and can change its posture in various ways and can be formed symmetrically. In detail, the sofa has a backrest integrally formed on one side in the width direction of a long and slender base, and a seat having a cushion material and a seat frame is provided on the base. Armrests having armrest frames are arranged on both sides of the seat. The seat has a length approximately equal to the length of the base, and the seat frame is divided into approximately three equal parts in the longitudinal direction, and has a central frame and a pair of side frames on both sides of the central frame. Only the central frame is fixed parallel to the base, and one end side of the pair of side frames is connected to the central frame via a ratchet-type hinge mechanism so as to be freely rotatable at a plurality of inclination positions, and the other end side is connected to the armrest frame via a ratchet-type hinge mechanism so as to be freely raised and lowered at a plurality of inclination positions. This sofa is characterized in that when both armrest frames are lowered via the hinge mechanism, the seat and both armrests can be formed flat, and both armrests are configured to protrude from the base on both sides in the longitudinal direction.

[0003] The relationship between the side frames, armrest frames and cushioning is described and illustrated as follows: The seat and armrest have a seat frame and armrest frame made of pipe material inside the cushioning, which are rotatably connected via a ratchet-type hinge mechanism. A reinforcing pipe is attached to an appropriate position of the seat frame, which is made of a pair of parallel pipe materials, to connect the parallel pipes. A number of cloth strips (not shown) are wrapped and fixed around the armrest frame and seat frame as retainers for the cushioning. Cushioning is then attached to both sides of the outer periphery, and the outer periphery of the cushioning is covered with sheet material or leather material (not shown).

[0004] According to this, the sofa has a seat frame divided into three equal parts, only the central frame is fixed parallel to the base, and the side frames and armrest frames on both sides are connected by hinge mechanisms so that they can be rotated to hold multiple inclination positions, so that when the sofa is used as a simple bed, the posture of the seat and armrests can be changed in various ways. This allows the feet, back, and head to be tilted to a desired posture with the legs stretched out. Furthermore, the left and right sides are symmetrical about the central frame, so that when used as a bed, the head can be positioned on either side and the person can lie on their back in any posture, and as an example, an adult and a child can lie side by side with their heads facing in opposite directions, or sit and stretch their legs out. Moreover, the posture of each head and shoulders can be freely adopted. In addition, when the armrests are raised, the sofa is compact and does not take up much space. At the same time, when the armrests are lowered, the sofa becomes a long, spacious simple bed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2007-289324 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the conventional example shown in Patent Document 1 has the following problems. Figure 15 shows a conventional sofa using Patent Document 1 as an example. Figure 15 shows the reference numbers in Patent Document 1 with 6 added to the beginning. For example, the seat 5 shown in Figure 3 of Patent Document 1 is shown with the reference number 65. Figure 15(a) shows the seat 65 and the armrest 67 in a flat state. Figure 15(b) shows the armrest frame 66 and the side frame 64b in a bent state at the hinge mechanisms 68, 69. Focusing on the relationship between the seat frame 64 and the armrest frame 66 and the cushion material 63, the seat 65 and the armrest 67 have the seat frame 64 and the armrest frame 66 made of pipe material inside the cushion material 63. Furthermore, the cushion material 63 is formed integrally without any partition in the direction from the head to the foot.

[0007] As shown in Fig. 15(b), the amount of bending is greater at portion B. Then, when the armrest frame 66 and the side frame 64b are bent relative to each other by the hinge mechanism 69, the cushion material 63 is in an extremely compressed state on the valley fold side. Conversely, the cushion material 63 is in an extremely tensed state on the mountain fold side. In other words, there is compression and tension in the thickness direction. For this reason, when a user tries to bend the seat portion 65, he or she needs to apply a load against the reaction force generated by the compression and tension of the cushion material 63.

[0008] Furthermore, as the seat 65 is repeatedly bent, the load on the cushion material 63 may accumulate, causing the cushion material 63 to sag. In that case, there is a risk of the bent portion being dented when the seat 65 is extended. This is particularly noticeable when the cushion material 63 is thick. Similarly, bending occurs at the portion C, although the amount of bending is smaller than that at the portion B. The hinge mechanism 68 bends between the central frame 64a and the side frame 64b. At the portion C, the cushion material 63 is in a compressed state on the side that forms a valley fold, and in a tensile state on the side that forms a mountain fold, as at the portion B. Although the degree is smaller than that at the portion B, the cushion material 63 is also compressed and tensed at the portion C when bent, so the user needs to apply a certain amount of load when operating the cushion material 63.

[0009] The present invention is devised to solve the problems of the related art, and aims to provide a sofa bed that reduces resistance when bending and improves the durability of the cushion. [Means for solving the problem]

[0010] A sofa bed according to one aspect of the present invention comprises a cushion, a plurality of frames forming a frame supporting the cushion, and a plurality of bending portions that flexibly connect the frames in the longitudinal direction of the cushion, and if one side of the cushion in the thickness direction is defined as the first side and the other side as the second side, the cushion is divided into the first side and the second side in the thickness direction, sandwiched between the frame, and in the longitudinal direction, the cushion is divided by the bending portions into a first cushion, a second cushion, a third cushion, a fourth cushion, and a fifth cushion, in that order, from one end to the other end, and at least one specific cushion among the cushions is formed only on the first side, and the second side is a gap, and the cushion is bendable in conjunction with the bending movement of the frame at the bending portions.

[0011] According to this, in the sofa bed according to the embodiment of the present invention, the cushion is divided in the thickness direction by sandwiching the frame, and is divided into five cushions in the longitudinal direction. In the thickness direction, it is divided into a first side cushion and a second side cushion. A specific cushion among the five cushions is formed only on the first side, and the second side is a gap. Therefore, when a user bends the specific cushion relatively to an adjacent cushion, the resistance due to compression and / or tension of each cushion can be reduced. Furthermore, since the resistance at the time of bending is reduced, the user can increase the relative bending amount between the specific cushion and the adjacent cushion.

[0012] In addition, in the sofa bed, the first cushion, the second cushion, and the second side of the third cushion may be formed by an integrated first sheet-like cushion, and the specific cushion may be the fourth cushion.

[0013] In this case, since the second side of the cushion is formed integrally from the first cushion to the third cushion, the number of parts can be reduced compared to the first side, and assembly can be improved and costs can be reduced. Furthermore, since the specific cushion is the fourth cushion, the fourth cushion can be easily bent between the adjacent cushions.

[0014] In addition, the sofa bed may be configured such that the specific cushion has a lower density than the other cushions. In this case, the specific cushion has a lower density than the other cushions, and therefore has a smaller resistance when bending. Therefore, it is possible to reduce the resistance due to compression and / or tension when the user bends between the specific cushion and the adjacent cushion.

[0015] In addition, the frame of the sofa bed may include a first frame, a second frame, a third frame, a fourth frame, and a fifth frame, arranged in that order from one end to the other end in the longitudinal direction, and the bent portion may include a first bent portion, a second bent portion, a third bent portion, and a fourth bent portion, arranged in that order from one end to the other end in the longitudinal direction, and from the first bent portion to the third bent portion, the first sides of the cushions may be bent toward each other and may be capable of retaining their positions after bending, and at the fourth bent portion, the first sides of the cushions may be bent toward each other and further the second sides of the cushions may be bent toward each other and may be capable of retaining their positions after bending, and from the first bent portion to the fourth bent portion, the first frame to the fifth frame may be returned to a shape in which the first frame to the fifth frame are connected in a substantially planar manner.

[0016] In this case, the first sides of the cushion can be bent toward each other from the first bent portion to the third bent portion and can be held in a bent state, so the user can use the cushion in a bent state in a predetermined shape. The fourth bent portion can be bent in both directions and can hold the position after the second sides of the cushion are bent toward each other, so the flexibility of the shape can be increased. Furthermore, the first frame to the fifth frame can be returned to a substantially flat shape, so the cushion can be used in both a bent state and a substantially flat state.

[0017] In addition, in the sofa bed, from the first cushion to the fourth cushion, adjacent cushions can be bent toward each other so that their first sides come closer to each other, and can maintain their positions after bending, the fourth cushion and the fifth cushion can be bent toward each other so that their first sides come closer to each other, and by bending the fourth cushion relative to the third cushion and further bending the fifth cushion relative to the fourth cushion, the first side of the fifth cushion can be displaced to a state where it is close to and faces the first side of the third cushion, and further, the second cushion and the third cushion can be bent so that the angle between the first sides of each cushion is obtuse, and can maintain their positions after bending.

[0018] In this case, the first and second cushions of the sofa bed can be held in a bent position so that the sofa bed can be used as a backrest, and the fifth cushion can be folded toward the first side of the third cushion. Thus, the sofa bed can be held in a plurality of positions, such as a mattress style and a sofa style, and can be folded into a shape suitable for storage. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a plan view of a sofa-bed 1 according to an embodiment of the present invention, showing a first side 11 of a cushion 2 in phantom. [Diagram 2] 2 is a cross-sectional view showing section II in FIG. 1. [Diagram 3] 2 from which the second sheet-shaped cushion 50 has been removed. [Figure 4] 1 is a perspective view showing a frame unit 30 in which frames 3 are connected by bent portions 4, and showing a state in which the frame unit 30 extends in a planar manner in the longitudinal direction. [Diagram 5] FIG. 4 shows a state in which the frames 3 of the frame unit 30 are bent at the bent portions 4 in directions approaching each other toward the first sides 11. In FIG. [Figure 6] FIG. 5 illustrates a state in which the fifth frames 35 of the frame unit 30 are bent at the fourth bent portion 44 in a direction approaching the second side 12. [Figure 7] FIG. 4 is a perspective view of FIG. 3, showing a state in which the cushion 2 is disposed on a first side 11 and a second side 12 with the frame unit 30 sandwiched therebetween in the thickness direction. [Figure 8] 4 is a side view showing a second bent portion 42. FIG. [Figure 9] 2 is a side view showing a first bent portion 41 and a third bent portion 43. FIG. [Figure 10] 4 is a side view showing a fourth bent portion 44. FIG. [Figure 11]The sofa bed 1 according to this embodiment of the present invention shows changes in state in which the sofa bed 1 is bent at the bend 4 when placed on the placement surface 7, where (a) shows the form shown in FIG. 2, (b) shows a form in which the first cushion 21 is bent clockwise at the first bend 41 from the form in (a), and (c) shows a form in which the second cushion 22 is bent clockwise at the second bend 42 from the form in (b). [Figure 12] 11(a) shows a continuation of the state change shown in FIG. 11(c), in which the fourth cushion 24 is bent counterclockwise at the third bend 43 and the fifth cushion 25 is bent clockwise at the fourth bend 44, and (b) shows a state in which the fifth cushion 25 is made approximately parallel to the installation surface 7 compared to (a). [Figure 13] 12(a) shows a continuation of the state change shown in FIG. 12(b), in which the fifth cushion 25 is bent counterclockwise at the fourth bend 44 and the second cushion 22 is bent clockwise at the second bend 42, and (b) shows a state in which the fifth cushion 25 is bent further counterclockwise at the fourth bend 44 relative to (a). [Figure 14] 14 shows a continuation of the state change shown in FIG. 13, where (a) shows a state in which the first cushion 21 is bent clockwise at the first bent portion 41 from the state in FIG. 13(b), and (b) is a detailed view of part A in (a). [Figure 15] 1A and 1B are cross-sectional views showing a conventional sofa, in which (a) shows the sofa in a flat state and (b) shows the sofa in a bent state in which the cushion material 63 is bent. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, a sofa bed 1 embodying the present invention will be described with reference to the drawings. The description of the embodiment of the invention and the drawings to which reference is made are used to explain the technical features that the present invention may employ. The present invention is not limited thereto. The configuration of the device shown in the drawings is merely an illustrative example and is not intended to limit the present invention.

[0021] <Overall configuration of sofa bed 1> The overall configuration of a sofa bed 1 according to an embodiment of the present invention will be described. As shown in FIG. 1 and FIG. 3, the sofa bed 1 includes a cushion 2, a plurality of frames 3 that form a frame supporting the cushion 2, and a plurality of bent portions 4 that bendably connect the frames 3 in the longitudinal direction of the cushion 2. The longitudinal direction here refers to the long side when the sofa bed 1 is stretched out in a plane and becomes a rectangular parallelepiped. The width direction is a direction perpendicular to the longitudinal direction, and the thickness direction is a direction perpendicular to the longitudinal direction and the width direction. As shown in FIG. 2 and FIG. 3, one side in the thickness direction is the first side 11, and the other side is the second side 12. The cushion 2 is divided into the first side 11 and the second side 12 in the thickness direction, sandwiching the frame 3 therebetween. In the longitudinal direction, the cushion 2 is divided by the bent portion 4 into a first cushion 21, a second cushion 22, a third cushion 23, a fourth cushion 24, and a fifth cushion 25 in that order from one end to the other end. At least one specific cushion of the cushions 2 is formed only on the first side 11, and the second side 12 is a gap 14. As shown in Figs. 11 to 14 described later, the cushion 2 is bendable in accordance with the bending operation of the frame 3 at the bending portion 4.

[0022] <Effect of the overall configuration of sofa bed 1> According to the overall configuration of the sofa bed 1 described above, the following effects are achieved. As shown in FIG. 3, the sofa bed 1 is divided into five cushions 2 in the longitudinal direction by dividing the cushion 2 in the thickness direction across the frame 3. The cushion 2 is divided into a cushion 2 on the first side 11 and a cushion 2 on the second side 12 in the thickness direction. A specific cushion among the five cushions 2 is formed only on the first side 11, and the second side 12 is a gap 14. Therefore, when a user bends the specific cushion relatively to the adjacent cushion 2, the resistance due to compression and / or tension of each cushion 2 can be reduced. Furthermore, since the resistance at the time of bending is reduced, the user can increase the relative bending amount between the specific cushion and the adjacent cushion 2. In the example shown in FIG. 3 etc., the specific cushion is the fourth cushion 24, but the effect when the fourth cushion 24 is the specific cushion will be described later.

[0023] <Cushion 2 Configuration> Next, the configuration of the cushion 2 will be described in detail. In the example shown in FIG. 1 etc., the left side of the figure is the head side, and the right side is the leg side. As shown in FIG. 3, the first side 11 of the cushion 2 is separated from each other in the longitudinal direction by forming gaps 10 at the boundaries 5 between the first cushion 21 to the fifth cushion 25. The second sides 12 of the first cushion 21, the second cushion 22, and the third cushion 23 are formed by an integrated first sheet-like cushion 20. As shown in FIG. 2 and FIG. 3, the specific cushion is the fourth cushion 24, which is present only on the first side 11, and the second side 12 is a gap 14.

[0024] As shown in FIG. 3 and FIG. 7, the first cushion 21 to the third cushion 23 have a first cushion material 21a, a second cushion material 22a, and a third cushion material 23a on the first side 11, respectively, and a first sheet-like cushion 20 on the second side 12. The fourth cushion 24 has only the fourth cushion material 24a on the first side 11, and the second side 12 has a gap 14 as described above. Furthermore, the fifth cushion 25 has a fifth cushion material 25a on the first side 11, and a single fifth cushion material 25b on the second side 12. As shown in FIG. 7, the cushion 2 on the first side 11 and the cushion 2 on the second side 12 face each other across a frame unit 30 consisting of a frame 3 and a bent portion 4, which will be described later. As shown in FIG. 1, the length L1 of the cushion 2 in the width direction is longer than the length L2 of the frame 3.

[0025] The specific cushion is the fourth cushion 24, which has a lower density than the others. The fourth cushion 24 has a lower density than the first cushion material 21a to the third cushion material 23a of each of the first sides 11 and the fifth cushion material 25a. For example, the fourth cushion material 24a of the fourth cushion 24 is made of urethane foam and has a density of 16 kg / m 3The first side 11 of the other cushion 2 is made of a functional material that embodies various functions by crushing and blending materials with different characteristics. It is a material that effectively utilizes crushed products and scraps generated during the production process. The density is, for example, 65 kg / m 3 It should be noted that the respective densities do not need to be exactly the values ​​mentioned above, and it is sufficient that there is a difference in density between the fourth cushion 24 and the first sides 11 of the other cushions 2.

[0026] In the example shown in FIG. 3, the cushion 2 has a thickness t1 of the first side 11 that is thicker than a thickness t2 of the second side 12. A gap 13 is formed between the first side 11 and the second side 12 of the cushion 2 in the thickness direction. The gap 13 is formed to correspond to the dimension in the thickness direction of the frame 3. For example, the first sheet-like cushion 20 may use a material similar to the fourth cushion material 24a. The fifth cushion material 25b may use a material similar to the fifth cushion material 25a. In this case, the first side 11 has the first cushion 21 to the third cushion 23, and the fifth cushion 25 having a higher density than the fourth cushion 24. The second side 12 has the fifth cushion material 25b having a higher density than the first sheet-like cushion 20.

[0027] <Effects of cushion 2 configuration> According to the configuration of the cushion 2 described above, the following effects are achieved. As shown in FIG. 3, the cushion 2 has a gap 13 between the first side 11 and the second side 12 in the thickness direction. Since the gap 13 exists between the first side 11 and the second side 12 in the thickness direction, the cushion 2 on the first side 11 and the cushion 2 on the second side 12 are separated. When bending at the bending portion 4, the cushion 2 on one side in the thickness direction is mainly compressed, and the cushion 2 on the other side is mainly tensed. If the cushion 2 is not separated between the first side 11 and the second side 12 but is integrated, a boundary area between compression and tension occurs during bending, which becomes resistance during bending. In contrast, since the cushion 2 on the first side 11 and the cushion 2 on the second side 12 are separated, the side where compression mainly occurs during bending and the side where tension mainly occurs during bending are separated. Therefore, it is possible to reduce the resistance due to compression and / or tension occurring during bending.

[0028] Also, since the first side 11 from the first cushion 21 to the fifth cushion 25 has a gap 10 formed at the boundary portion 5 in the longitudinal direction, it is possible to reduce compression and / or tension when the cushion 2 is bent at the boundary portion 5. Furthermore, since the cushion 2 has a reduced portion at the boundary portion 5 where compression and tension are repeated every time the cushion 2 is bent, it is possible to improve durability.

[0029] In addition, since the second side 12 of the cushion 2 is formed integrally from the first cushion 21 to the third cushion 23, the number of parts can be reduced compared to the first side 11, which improves assembly and reduces costs.

[0030] Furthermore, since the specific cushion is the fourth cushion 24, it is possible to reduce resistance due to compression and / or tension of each cushion 2 when the user bends the fourth cushion 24 relatively between the adjacent third cushion 23 and the adjacent fifth cushion 25. Since the resistance during bending is reduced, the user can increase the relative amount of bending between the fourth cushion 24 and the adjacent third cushion 23 and fifth cushion 25.

[0031] In addition, since the fourth cushion 24, which is a specific cushion, has a lower density than the others, the resistance when bending is small. When the user bends between the fourth cushion 24 and the adjacent third cushion 23 and between the fourth cushion 24 and the adjacent fifth cushion 25, the resistance due to compression and / or tension can be reduced. Therefore, the bending angle between the fourth cushion 24 and the third cushion 23 and the fifth cushion 25 can be relatively large.

[0032] Furthermore, since the thickness t1 of the first side 11 of the cushion 2 is greater than the thickness t2 of the second side 12, the first side 11 can maintain its cushioning properties as the side that comes into contact with the user. As already explained, the first side 11 of the cushion 2 is thicker than the second side 12, but adjacent cushions 2 are separated at the boundary portion 5 by a gap 10, so that resistance during bending is reduced. The second side 12 of the cushion 2 is the first sheet-like cushion 20 in which the first cushion 21 to the third cushion 23 are integrally formed, but the thickness t2 is thin, so that resistance during bending is reduced.

[0033] <Frame 3 Configuration> Next, the configuration of the frame 3 will be described in detail. As shown in FIG. 4, the frame 3 includes a first frame 31, a second frame 32, a third frame 33, a fourth frame 34, and a fifth frame 35, which are arranged in this order from one end to the other end in the longitudinal direction. As shown in FIG. 1 and FIG. 4, the first frame 31 and the fifth frame 35 are formed of pipe material that is substantially U-shaped in a plan view, and the fifth frame 35 is connected in the width direction by an auxiliary frame 37. The second frame 32 to the fourth frame 34 are formed of two pipe materials arranged in parallel to face each other in the width direction, and the second frame 32 is connected by one auxiliary frame 37, and the third frame 33 is connected by two auxiliary frames 37. Furthermore, a band 6 is attached to the frame 3 across the width direction. One band 6 is attached to the first frame 31, two bands 6 are attached to the third frame 33, and two bands 6 are attached to the fifth frame 35.

[0034] As shown in Fig. 4, the frames 3 are connected by bent portions 4 to form a frame unit 30. In the longitudinal direction, the first bent portion 41 is between the first frame 31 and the second frame 32, and the second bent portion 42 is between the second frame 32 and the third frame 33. The third bent portion 43 is between the third frame 33 and the fourth frame 34, and the fourth bent portion 44 is between the fourth frame 34 and the fifth frame 35. As shown in Figs. 3 and 4, the distance L3 between the first bent portion 41 and the second bent portion 42 is wider than the distance L4 between the third bent portion 43 and the fourth bent portion 44.

[0035] <Effect of the composition of frame 3> The above-described configuration of the frame 3 provides the following effects. As shown in Fig. 3 and Fig. 4, in the frame unit 30 formed by the frame 3 and the bending portion 4, the distance L3 between the first bending portion 41 and the second bending portion 42 is wider than the distance L4 between the third bending portion 43 and the fourth bending portion 44. Therefore, as shown in Fig. 13(b) and Fig. 14(a) described later, when the first sides 11 from the first cushion 21 to the fifth cushion 25 are all bent in a valley shape, the fifth cushion 25 can be folded between the first cushion 21 and the third cushion 23.

[0036] <Configuration of bending portion 4> Next, the configuration of the bending portion 4 will be described. As shown in Fig. 4, the bending portion 4 includes a first bending portion 41, a second bending portion 42, a third bending portion 43, and a fourth bending portion 44 in this order from one end to the other end in the longitudinal direction. The first bending portion 41 and the third bending portion 43 are gears equipped with a ratchet-type free lock mechanism that can be fixed in 14 steps at 6° intervals as shown in Fig. 9 and can be bent in a range of up to 84°. The second bending portion 42 is a gear equipped with a ratchet-type free lock mechanism that can be fixed in 18 steps at 5° intervals as shown in Fig. 8 and can be bent in a range of up to 90°.

[0037] 10, the fourth bending portion 44 can be fixed in five stages at 6° intervals in one direction and can be bent in a range of up to 30°, and can be bent in the other direction in a free state of up to 106° without being fixed. Note that, although an example has been shown in which the fourth bending portion 44 is not fixed after bending in the other direction, it may be a gear equipped with a ratchet-type free lock mechanism that can be fixed in multiple stages at constant angle intervals in the other direction as well. In this case, the fourth bending portion 44 can be bent in both directions and can hold the position after bending.

[0038] 4, the first bent portion 41 to the fourth bent portion 44 are attached in pairs to the right and left sides in the width direction of the frame 3. The first bent portion 41 and the second bent portion 42, and the third bent portion 43 and the fourth bent portion 44 are attached in opposite directions to each other in the longitudinal direction.

[0039] <Effects of the configuration of the bent portion 4> The above-described configuration of the bending portion 4 provides the following effects. As shown in Figures 4 to 6 and 8 to 10, the bending angle and number of steps of the bending portion 4, as well as the gear equipped with a ratchet-type free lock mechanism in the bending direction, are selected according to the location where the bending portion 4 is to be disposed. Therefore, as will be described later, each cushion 2 can be displaced in a desired direction and the displaced shape can be maintained.

[0040] <Explanation of bending operation of frame 3 at bending portion 4> Next, the bending operation of the frame 3 at the bending portion 4 will be described. As shown in Figs. 5 and 6, the bending portion 4 can be bent from the first bending portion 41 to the third bending portion 43 so that the first sides 11 of the cushion 2 approach each other, and can hold the position after bending. The fourth bending portion 44 can be bent so that the first sides 11 of the cushion 2 approach each other, and can further bent so that the second sides 12 of the cushion 2 approach each other, and can hold the position after bending. From the first bending portion 41 to the fourth bending portion 44, the first frame 31 to the fifth frame 35 can be restored to a state in which they are connected in a substantially planar shape. The movement of the frame 3 at each bending portion 4 will be described in detail below.

[0041] As described with reference to Fig. 9, the first bending portion 41 and the third bending portion 43 can be fixed in 14 steps at 6° intervals, and the frame 3 can be bent in a range of up to 84°. Thus, as shown in Figs. 5 and 6, at the first bending portion 41, the first frame 31 can be bent clockwise in a range of up to 84° relative to the second frame 32, and the position after bending can be held in 14 steps at 6° intervals. Similarly, at the third bending portion 43, the fourth frame 34 can bent the frame 3 counterclockwise in a range of up to 84° relative to the third frame 33, and the position after bending can be held in 14 steps at 6° intervals. Furthermore, in either case, from a state bent in one direction, it can be bent in the other direction within the bending range and fixed in 6° intervals.

[0042] As described with reference to FIG. 8, the second bending portion 42 can fix the frame 3 in 18 steps at 5° intervals, and can bend the frame 3 in a range up to 90°. Therefore, as shown in FIG. 5 and FIG. 6, the second frame 32 can hold a position after being bent clockwise relative to the third frame 33 in 18 steps at 5° intervals at the second bending portion 42. Furthermore, from a state bent clockwise, the second bending portion 42 can be fixed at 5° intervals while being bent counterclockwise within a bendable range. The second bending portion 42 has a smaller interval of the bend angle by the ratchet than the other bending portions 4, and has a wider bendable angle range. Therefore, the bend angle of the second frame 32 can be adjusted in small increments, and the bendable range is also wide.

[0043] As described with reference to FIG. 10, the fourth bending portion 44 can bend the frame 3 in one direction in a free state up to 106°, and can bend the frame 3 in the other direction in five steps at 6° intervals, and can bend the frame 3 in a range up to 30°. Therefore, as shown in FIG. 5 and FIG. 6, at the fourth bending portion 44, the fifth frame 35 can be bent in a free state up to 106° counterclockwise relative to the fourth frame 34, and can be bent up to 30° clockwise at 6° intervals, and can hold the position after bending. Between 0° and 30° clockwise, the fifth frame 35 can be fixed at 6° intervals while bending counterclockwise from a state bent clockwise. As shown in FIG. 5, at the fourth bending portion 44, the fifth frame 35 can be bent in a free state up to 106° counterclockwise relative to the fourth frame 34, and can be further bent in a free state up to 30° clockwise at 6° intervals.

[0044] <Effect of bending operation of frame 3 at bending portion 4> The bending operation of the frame 3 at the bent portion 4 described above has the following effects. As shown in Figs. 5 and 6, the first bent portion 41 to the third bent portion 43 can be bent in the direction in which the first sides 11 of the cushion 2 approach each other and can maintain the bent state, so that the cushion 2 can be used in a bent state in a predetermined shape. The fourth bent portion 44 can be bent in both directions, and the fifth frame 35 can maintain a position after bending in the direction in which the second side 12 approaches the fourth frame 34, so that the flexibility of the shape can be increased. Furthermore, the first frame 31 to the fifth frame 35 can be restored to a substantially flat state, so that the cushion 2 can be used in both a flat state and a bent state.

[0045] The effect of the bending operation of the frame 3 at the bending portion 4 described above becomes more remarkable by adding the following configuration of the cushion 2 already described. That is, as shown in FIG. 2 and FIG. 3, the first cushion 21 to the fifth cushion 25 are separated by the gap 10 at the boundary portion 5 on the first side 11. The specific cushion is the fourth cushion 24, which is present only on the first side 11 and has a lower density than the other cushions 2 on the first side 11, and the second side 12 is a gap 14. On the second side 12, the first cushion 21, the second cushion 22, and the third cushion 23 are formed by an integrated first sheet-like cushion 20. Also, the cushion 2 on the second side 12 is thinner than the cushion 2 on the first side 11. The first sheet-like cushion 20 has a lower density than the first cushion 21 to the third cushion 23 and the first side 11 of the fifth cushion 25.

[0046] For these reasons, the first cushion 21 to the fourth cushion 24 are likely to bend in a direction in which the first sides 11 approach each other at the bending portion 4. Furthermore, the fifth cushion 25 is likely to bend in both directions relative to the fourth cushion 24. The reasons for this will be described below.

[0047] The first cushion 21 to the fourth cushion 24 bend in a direction in which the first sides 11 approach each other at the bending portion 4. When bending, the first side 11 of the cushion 2 deforms in a compressive direction, but the first cushion 21 to the fifth cushion 25 are separated by the gap 10 at the boundary portion 5 at the first sides 11, so the portion that undergoes compressive deformation is reduced. The first sheet-like cushion 20 is formed as a single unit, but deforms mainly in the tensile direction, so buckling due to bending is unlikely to occur. In addition, it is thinner and has a lower density than the first side 11 of the cushion 2. Therefore, resistance during bending is reduced.

[0048] In addition, the fourth cushion 24 is a special cushion. When the first sides 11 of adjacent cushions 2 are bent in a direction in which they approach each other relatively, the fourth cushion 24 has a low density and therefore has little compression resistance. When the second sides 12 are bent in a direction in which they approach each other, the fourth cushion 24 has a low density and therefore has little tensile resistance. Furthermore, since the second sides 12 are voids 14, the compression and tensile resistance during bending is very small. Therefore, the fifth cushion 25 can be easily bent in both directions relative to the fourth cushion 24.

[0049] <Description of the second sheet-like cushion 50 covering the cushion 2 etc.> Next, the second sheet-like cushion 50 that covers the cushion 2 and the like will be described. As shown in FIG. 2, the cushion 2 and the frame unit 30 consisting of the frame 3 and the bent portion 4 are integrally formed with the second sheet-like cushion 50 covering the periphery. The second sheet-like cushion 50 is formed of urethane foam. For example, the second sheet-like cushion 50 is made of the same material as the fourth cushion material 24a or the first sheet-like cushion 20. The second sheet-like cushion 50 is thinner than the first side 11 of the cushion 2 and thicker than the first sheet-like cushion 20. The second sheet-like cushion 50 has an adhesive applied to one side and is attached to the first side 11 and the second side 12 of the cushion 2. The second sheet-like cushion 50 is formed into a ring shape by covering the cushion 2 and the frame unit 30 shown in FIG. 7 in the thickness direction and width direction, and by bonding the end surface 51 so as to be in the state shown in FIG. 2 and the like. The cushion 2 and the frame unit 30 are integrated as the sofa bed 1 when covered by the second sheet-like cushion 50. The cushion 2 and the frame 3 may be fixed to each other by adhesion or the like.

[0050] <Effect of the second sheet-like cushion 50 covering the cushion 2, etc.> The second sheet-like cushion 50 described above has the following effects. As shown in FIG. 3, the frame unit 30 consisting of the cushion 2, the frame 3, and the bent portion 4 has a gap 10 at the boundary portion 5 formed on the first side 11, and a gap 14 in the fourth cushion 24 on the second side 12, and has an uneven surface. The second sheet-like cushion 50 is formed of urethane foam having a certain thickness, so it covers the uneven surface. Therefore, even if the user comes into contact with the gap 10 or the gap 14 at the boundary portion 5, discomfort or strange feeling such as denting is reduced. In addition, the second sheet-like cushion 50 is thinner than the first side 11 of the cushion 2. Furthermore, the first cushion material 21a to the third cushion material 23a have a lower density than the fifth cushion material 25a, so there is less resistance when bending.

[0051] <<The changeable form of sofa bed 1 and its effect>> Next, the displaceable form of the sofa bed 1 and its effect will be described through the bending action of the cushion 2. The cushion 2 is bent with the bending action of the frame 3 at the bending portion 4 already described. As shown in Fig. 11 to Fig. 14, the first cushion 21 to the fourth cushion 24 are bendable so that the first sides 11 of the adjacent cushions 2 are closer to each other, and the positions after bending can be maintained. The fourth cushion 24 and the fifth cushion 25 are bendable so that the first sides 11 are closer to each other. By bending the fourth cushion 24 with respect to the third cushion 23 and further bending the fifth cushion 25 with respect to the fourth cushion 24, the first side 11 of the fifth cushion 25 can be displaced to a state where it faces the first side 11 of the third cushion 23 in close proximity. Furthermore, the second cushion 22 and the third cushion 23 are bendable so that the angle between the first sides 11 of each cushion 22 and the third cushion 23 is obtuse, and the positions after bending can be maintained.

[0052] As a result, in the sofa bed 1, the first cushion 21 and the second cushion 22 can be held in a bent position so that they can be used as a backrest, and the fifth cushion 25 can be folded towards the first side 11 of the third cushion 23. Thus, the sofa bed 1 can be displaced into a plurality of forms, such as a mattress style and a sofa style, and can be folded into a form suitable for storage. The sofa bed 1 can achieve a plurality of functions with just one unit. Below, with reference to Figs. 11 to 14, the forms into which the sofa bed 1 can be displaced and the effects thereof will be described in order through the bending movement of the cushion 2.

[0053] <Mattress type and couch style type> With reference to Fig. 11 and Fig. 12, the sofa bed 1 will be described in the mattress style and the couch style. As shown in Fig. 11, the cushion 2 is used by placing the second side 12 on the installation surface 7. The sofa bed 1 in Fig. 11(a) is in a state in which it is expanded in a substantially flat shape. This allows the sofa bed 1 to be used as a mattress.

[0054] 11(b) shows a configuration in which the first cushion 21 is bent at the first bent portion 41 from the configuration in FIG. 11(a) to a side where the first sides 11 of the first cushion 21 approach each other relative to the second cushion 22. This allows the sofa bed 1 to use the first cushion 21 as a pillow.

[0055] Fig. 11(c) shows a configuration in which the second cushion 22 is bent at the second bent portion 42 from the configuration in Fig. 11(b) to the side where the first sides 11 of the second cushion 22 approach each other relative to the third cushion 23. This allows the first cushion 21 and the second cushion 22 of the sofa bed 1 to be used as a backrest. This is the so-called couch style.

[0056] 12(a) shows a configuration in which the fourth cushion 24 is bent relative to the third cushion 23 at the third bend 43 toward the side where their first sides 11 approach each other, and the fifth cushion 25 is bent relative to the fourth cushion 24 at the fourth bend 44 toward the side where their second sides 12 approach each other, from the configuration in FIG. 11(c). This allows the user to lie down naturally with their knees bent on the sofa bed 1. The sofa bed 1 can be configured in a so-called couch style with a leg-resting function.

[0057] 12(b) shows a configuration in which the fifth cushion 25 is bent at the fourth bend portion 44 from the configuration in FIG. 12(a) toward the side where the first sides 11 of the fourth cushion 24 approach each other, so that the fifth cushion 25 is made approximately parallel to the installation surface. This allows the user to lie down on the sofa bed 1 with their knees stretched out. This is a configuration that adds a leg-raising function to the so-called couch style.

[0058] As described above with reference to Figures 11 and 12, the sofa bed 1 can be used in the form of a mattress and in a number of couch styles. The movement of the cushion 2 in Figures 11 and 12 is due to the configuration of the first bending portion 41 to the fourth bending portion 44, which allows the frame 3 to bend within a predetermined angle range and can hold the position after bending, and further, the fourth bending portion 44 is configured to be bent in both directions.

[0059] <Sofa style and storage style> Next, referring to Fig. 13 and Fig. 14, a case where the sofa bed 1 is put into the sofa style form or the stored form will be described. As shown in Fig. 13, the first side 11 of the fifth cushion 25 is displaced from the form shown in Fig. 12(b) to a state where it faces the first side 11 of the third cushion 23. At this time, the fourth cushion 24 is bent relative to the third cushion 23 at the third bending portion 43 to a side where the first sides 11 of the fourth cushion 24 approach each other, and further, the fifth cushion 25 is bent relative to the fourth cushion 24 at the fourth bending portion 44 to a side where the first sides 11 of the fourth cushion 24 approach each other.

[0060] Here, the state in which the first side 11 of the fifth cushion 25 and the first side 11 of the third cushion 23 face each other is within the following range. As shown in FIG. 13(a), a perpendicular line from the surface of the first side 11 of the fifth cushion 25 is defined as a perpendicular line P. The facing state is a state in which the fifth cushion 25 is bent with respect to the fourth cushion 24 at the fourth bending portion 44 toward the side where the first sides 11 of the fifth cushion 25 and the third cushion 23 are closer to each other, and the perpendicular line P intersects with the first side 11 of the third cushion 23 or intersects with an extension of the surface of the first side 11 of the third cushion 23 in the longitudinal direction. Furthermore, as shown in FIG. 13(b), the state includes a state in which the surface of the first side 11 of the fifth cushion material 25a is approximately parallel to the surface of the first side 11 of the third cushion material 23a or is in contact with it. That is, the state in which the first side 11 of the fifth cushion 25 and the first side 11 of the third cushion 23 face each other includes the state shown in FIG. 13(a) and the state shown in FIG. 13(b).

[0061] Fig. 13(b) shows a case where a sofa-style seat part is formed. From the state of Fig. 13(a), the fifth cushion 25 is bent at the fourth bending part 44 with respect to the fourth cushion 24 so that the first sides 11 of the fifth cushion 25 approach each other, and the fifth cushion material 25a and the third cushion material 23a are opposed to each other substantially parallel to each other, or the fifth cushion material 25a is displaced until it comes into contact with the third cushion material 23a. In the form of Fig. 13(b), the fifth cushion material 25b of the second side 12 of the fifth cushion 25 is on the upper side in the thickness direction. This form is the so-called sofa style.

[0062] As described with reference to Fig. 8, the second bending portion 42 can bend the frame 3 within a range of 90° at 5° intervals, and can maintain the bent state. As shown in Fig. 13(a), due to the configuration of the second bending portion 42, the second cushion 22 and the third cushion 23 can be bent so that the angles they form with the first sides 11 become obtuse angles, and can maintain the bent positions.

[0063] As a result, as shown in Fig. 12 and Fig. 13, the sofa bed 1 can use the first cushion 21 and the second cushion 22 as a backrest. Moreover, the angle can be adjusted in small increments over a wide range, from a couch style to a sofa style, to suit the user's preference. The user can also sit on the fifth cushion 25. The fifth cushion material 25b is made of the same material as the first cushion material 21a to the third cushion material 23a and the fifth cushion material 25a, so that when the user sits on it, the user can get the same seating comfort as when sitting on the first side 11.

[0064] Next, the sofa style in which the sofa bed 1 has an armrest function or is in a stored state will be described. FIG. 14 shows the sofa bed 1 in its smallest size. FIG. 14(a) shows a state in which the first cushion 21 is bent from the state shown in FIG. 13(b) toward the side where the first sides 11 of the first cushion 21 and the second cushion 22 are closer to each other at the first bent portion 41. This allows the sofa bed 1 to be in a so-called sofa style in which the first cushion 21 has an armrest function. Or, it can be in a stored state. This is because, as shown in FIG. 3 and FIG. 4, the distance L3 between the first bent portion 41 and the second bent portion 42 is wider than the distance L4 between the third bent portion 43 and the fourth bent portion 44.

[0065] As shown in Fig. 14(b), the deformation of the cushion 2 occurs more significantly in the vicinity of the fourth bent portion 44 and in the vicinity of the third bent portion 43. In contrast, the sofa bed 1 has the following configuration so that it can be displaced into the form shown in Fig. 14(a). That is, the specific cushion is the fourth cushion 24, which is present only on the first side 11 and the second side 12 is a gap 14. Furthermore, the fourth cushion 24, which is the specific cushion, has a lower density than the others.

[0066] As a result, in the sofa bed 1, since the second side 12 of the fourth cushion 24 is the gap 14, there are fewer portions that are subjected to deformation on the pulling side, and resistance when bending is low. In addition, since the fourth cushion 24 has a lower density than the first sides 11 of the other cushions 2, resistance when compressed is low. Therefore, resistance when bending relatively between the third cushion 23 and the fifth cushion 25 and the fourth cushion 24 is reduced.

[0067] Furthermore, the third cushion 23 and the fourth cushion 24, and the fourth cushion 24 and the fifth cushion 25 can be bent until the angle between the first sides 11 of the third cushion 23 and the fourth cushion 24, and the fourth cushion 24 and the fifth cushion 25, respectively, becomes small as shown in Fig. 13 and Fig. 14. In addition, durability against bending is improved, and the amount of bending can be increased. The sofa bed 1 can be transformed into a sofa style or a compact form suitable for storage.

[0068] 11 to 14 show an example in which the sofa bed 1 is provided with the second sheet-like cushion 50. For example, the fifth cushion material 25a contacts the third cushion material 23a via the second sheet-like cushion 50. In contrast, the sofa bed 1 may be configured not to include the second sheet-like cushion 50. In that case, the cushion 2 of the sofa bed 1 is exposed on the surface. [Explanation of symbols]

[0069] 1 sofa bed 2 Cushion 3 Frame 4 Bend 7 Installation surface 10, 13, 14 void 11 First side 12 Second side 20 First sheet-shaped cushion 21 First Cushion 22 Second Cushion 23 Third Cushion 24 Fourth Cushion 25 Fifth Cushion 31 First Frame 32 Second Frame 33 Third Frame 34 Fourth Frame 35 Fifth Frame 41 First bending part 42 Second bending part 43 Third bend 44 Fourth bend

Claims

1. Cushion and A plurality of frames forming a frame for supporting the cushion; A plurality of bending portions are provided to bendably connect the frames in a longitudinal direction of the cushion, When one side in the thickness direction of the cushion is defined as a first side and the other side is defined as a second side, The cushion is The frame is divided into the first side and the second side in the thickness direction, In the longitudinal direction, the cushion is divided by the bent portion into a first cushion, a second cushion, a third cushion, a fourth cushion, and a fifth cushion in this order from one end to the other end, At least one specific cushion among the cushions is formed only on the first side, and the second side is a gap; The cushion is bendable in accordance with the bending movement of the frame at the bending portion.

2. the first cushion, the second cushion, and the second side of the third cushion are formed by a single sheet-like cushion; 2. The sofa bed according to claim 1, wherein the specific cushion is the fourth cushion.

3. 3. The sofa bed of claim 2, wherein the particular cushion has a lower density than the others.

4. The frame is a first frame, a second frame, a third frame, a fourth frame, and a fifth frame arranged in this order from one end to the other end in the longitudinal direction; The bent portion is In the longitudinal direction, a first bent portion, a second bent portion, a third bent portion, and a fourth bent portion are provided in this order from one end portion to the other end portion, From the first bent portion to the third bent portion, the first sides of the cushions can be bent toward each other and can maintain their positions after bending, The fourth bending portion is capable of bending the first sides of the cushions toward each other, and further capable of bending the second sides of the cushions toward each other, and is capable of retaining a position after bending; The sofa bed according to claim 1, wherein the first bent portion to the fourth bent portion are returnable to a state in which the first frame to the fifth frame are connected in a substantially flat shape.

5. The first cushion to the fourth cushion are bendable such that the first sides of the adjacent cushions are bent toward each other and can maintain their positions after bending. The fourth cushion and the fifth cushion are bendable such that the first sides of the fourth cushion and the fifth cushion are adjacent to each other, The fourth cushion is bent relative to the third cushion, and the fifth cushion is further bent relative to the fourth cushion, the first side of the fifth cushion is displaceable to a state in which it closely faces the first side of the third cushion; The sofa bed according to any one of claims 1 to 4, further comprising: a second cushion and a third cushion that are bent so that the angle they form with respect to the first side is an obtuse angle; and that are capable of maintaining their bent positions.

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