Connecting structure of elastic units for sofa bed, elastic layer and sofa bed

Abstract

Provided in the present invention is a connecting structure of elastic units for a sofa bed. The sofa bed comprises a left armrest, a right armrest and a bed frame fixed to the left armrest and the right armrest, wherein the bed frame is provided with a plurality of fixing members in an array, and bottoms of the elastic units are locked on the fixing members of the bed frame; two first connecting members and two second connecting members are arranged on the periphery of an upper portion of each elastic unit; the first connecting members and the second connecting members are alternatively arranged; and two adjacent elastic units are in butt joint by means of the first connecting members and the second connecting members. Further provided in the present invention is an elastic layer of a sofa bed. The elastic layer comprises a plurality of elastic units arranged in an array, adjacent elastic units being connected by means of the fixing structure described above. Further provided in the present invention is a sofa bed, comprising a structural framework, a mattress layer and an elastic layer, wherein the elastic layer is the elastic layer described above; and the mattress layer is fixed to the elastic layer.

Description

Connection structure of sofa bed elastic unit, elastic layer and sofa bed

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority based on and the Chinese patent application filed with the State Intellectual Property Office of China on April 3, 2024, with application number: 2024104036966, and the invention title: "A connection structure, elastic layer and sofa bed of a sofa bed elastic unit". The content of the Chinese patent application is hereby introduced into the text of this application. Technical Field

[0003] The present invention relates to a piece of furniture, in particular to a sofa bed. Background Art

[0004] As people's material lives improve, their demand for furniture is diversifying. Sofa beds have become a popular choice. Existing sofa beds have several drawbacks. For example, they struggle to switch smoothly between their two positions, making it difficult for operators with limited strength to do so alone. They can be unstable when used as a sofa, potentially changing the angle between the seat and backrest, affecting comfort. Furthermore, existing folding beds offer a limited number of folding methods, failing to meet the diverse needs of users.

[0005] Even if the aforementioned issues could be addressed, current sofa beds still suffer from numerous minor shortcomings. For example, the cushions and elastic layer are prone to relative movement during use; the base support structure of the sofa bed cannot support both the sofa and bed frames; the mounting method between the bed frame and the bed board of the main frame is inappropriate; the various components of the sofa bed cannot be disassembled or folded; and if spring modules are present, their mounting method is often inappropriate. Summary of the Invention

[0006] The main technical problem to be solved by the present invention is to provide a connection structure for the elastic units of a sofa bed, which facilitates the assembly of the elastic units into an elastic layer, and the elastic layer formed by the assembly remains stable when the sofa bed is folded into a sofa shape, while also facilitating the removal and replacement of the elastic units from the elastic layer.

[0007] In order to solve the above-mentioned technical problems, the present invention provides a connection structure for elastic units of a sofa bed, wherein the sofa bed includes a left armrest, a right armrest, and a bed frame fixed to the left and right armrests, wherein fixing members are arranged in an array on the bed frame, and the bottom of the elastic unit is locked to the bed frame fixing members; two first connecting members and two second connecting members are arranged around the upper part of the elastic unit; the first connecting members and the second connecting members are arranged alternately; and two adjacent elastic units are connected via the first connecting members and the second connecting members.

[0008] In some embodiments, the first connector and the second connector are plug-in connections.

[0009] In some embodiments, the first connecting member is an insert block, and the second connecting member is a slot that cooperates with the first connecting member.

[0010] In some embodiments, an elastic arm is provided on the surface of the plug, and a protrusion is provided on the surface of the elastic arm; the side wall of the slot is provided with an opening that is limited by the protrusion; when the elastic arm is in the initial position, the protrusion is placed in the opening and is limited by the opening opposite to the plug-in direction.

[0011] In some embodiments, an elastic arm is provided on each side of the plug block, and the elastic arm has a protrusion on the side away from the plug block; the two side walls of the slot along the length direction are respectively provided with openings that cooperate with the protrusion in a limiting manner; when the elastic arm is in the initial position, the protrusion is placed in the opening and cooperates with the opening in a limiting manner opposite to the plug-in direction.

[0012] In some embodiments, the first connector and the second connector are rotatably plug-in connected.

[0013] In some embodiments, the first connecting member is a rotating block extending along the height direction, and the second connecting member is a limiting groove cooperating with the rotating block;

[0014] The rotating block has a first position and a second position relative to the limiting slot. When the rotating block is in the first position, the rotating block and the limiting slot are released from the limiting fit in the direction opposite to the direction in which the rotating block is inserted into the limiting slot; when the rotating block is in the second position, the rotating block and the limiting slot are limitedly fitted in the direction opposite to the direction in which the rotating block is inserted into the limiting slot.

[0015] In some embodiments, the limiting groove is a strip-shaped groove; the length of the rotating block is smaller than the length of the limiting groove and larger than the width of the limiting groove.

[0016] In some embodiments, an operating portion for driving the rotating block to rotate is further provided on the surface of the first connecting member.

[0017] In some embodiments, a bed board is laid on the bed frame, and the elastic unit array is arranged on the bed board and is locked or weakly connected to the bed board.

[0018] The present invention also provides a connection structure for an elastic unit of a sofa bed, wherein the sofa bed includes a left armrest, a right armrest, and a bed frame fixed to the left armrest and the right armrest. Fixing members are arranged in an array on the bed frame, and the bottom of the elastic unit is locked on the bed frame fixing members; four first connecting members are symmetrically arranged around the upper part of the elastic unit; and the first connecting members of adjacent elastic units are connected through an intermediate connecting member.

[0019] In some embodiments, the intermediate connector and the first connector are connected via a plug-in connection.

[0020] In some embodiments, the first connecting member is a slot, and the intermediate connecting member includes a connecting belt and inserting blocks provided at both ends of the connecting belt.

[0021] In some embodiments, the intermediate connector and the first connector are connected by a rotational plug-in connection.

[0022] In some embodiments, the first connecting member is an arc-shaped slot extending along the rotation direction, and the intermediate connecting member includes a first portion placed in the arc-shaped slot and a second portion passing through the arc-shaped slot;

[0023] The diameter of one end of the arc-shaped slot is larger than the second portion, and the diameter of the other end is smaller than the second portion;

[0024] When the second part rotates to one end of the corresponding arc-shaped slot, the connection between the connecting piece and the connecting fitting is released; when the second part rotates to the other end of the corresponding arc-shaped slot, the connecting piece and the connecting fitting are limitedly engaged in the direction opposite to the direction in which the connecting piece is inserted into the connecting fitting.

[0025] In some embodiments, the intermediate connecting member further includes an operating portion disposed on a surface thereof for driving the intermediate connecting member to rotate.

[0026] In some embodiments, a bed board is laid on the bed frame, and the elastic unit array is arranged on the bed board and is locked or weakly connected to the bed board.

[0027] The present invention also provides a connection structure for an elastic unit of a sofa bed, comprising: the sofa bed includes a left armrest, a right armrest, and a bed frame fixed to the left armrest and the right armrest; fixing members are arranged in an array on the bed frame; the bottom of the elastic unit is locked on the bed frame fixing members; four first connecting members are symmetrically arranged around the upper part of the elastic unit; and the first connecting members of adjacent elastic units are butted together.

[0028] In some embodiments, the first connecting member includes an inserting portion and an inserted portion extending along the circumference of the elastic unit;

[0029] The inserting parts and the inserted parts of two adjacent elastic units form a butt-insertion arrangement.

[0030] In some embodiments, the inserting portion includes an elastic arm and a positioning card point provided on the elastic arm; the inserted portion is provided with a positioning groove that cooperates with the positioning card point.

[0031] In some embodiments, the inserted portion is provided with a clearance opening for the elastic arm to swing; the elastic arm swings along the direction of the clearance opening under the action of external force, so that the positioning card point is separated from the positioning groove.

[0032] In some embodiments, a bed board is laid on the bed frame, and the elastic unit array is arranged on the bed board and is locked or weakly connected to the bed board.

[0033] The present invention further provides an elastic layer of a sofa bed, comprising: a plurality of elastic units arranged in an array; adjacent elastic units are connected via the above-mentioned fixing structure.

[0034] The present invention also provides a sofa bed comprising a structural frame, a cushion layer and an elastic layer; the elastic layer is the elastic layer described above; and the cushion layer is fixed to the elastic layer.

[0035] In some embodiments, the structural frame includes a left armrest, a right armrest, a bed frame, and a bed board; the bed frame includes a first bed frame and a second bed frame sequentially arranged along the width direction of the armrest; the first bed frame is fixedly connected between the left armrest and the right armrest; the second bed frame is rotatably connected between the left armrest and the right armrest;

[0036] The bed boards are connected to the first bed frame and the second bed frame respectively.

[0037] In some embodiments, the second bed frame has a first position and a second position relative to the first bed frame. When the second bed frame is in the first position, the angle between the first bed frame and the second bed frame is 180°; when the second bed frame is in the second position, the angle between the first bed frame and the second bed frame is less than 180°.

[0038] In some embodiments, the left armrest and the right armrest are rotatably connected to the second bed frame via a folding hinge respectively;

[0039] The folding hinge includes a first arm and a second arm hingedly connected at one end; the other end of the first arm is fixedly connected to the left armrest or the right armrest, and the other end of the second arm is fixedly connected to the second bed frame.

[0040] Compared with the prior art, the present invention has the beneficial effect that when the bottom of the elastic unit arranged in an array is locked with the bed frame, or when the bottom of the elastic unit is weakly connected to the bed frame, multiple elastic units are connected to each other to form an elastic layer. When the sofa bed is folded into a sofa shape, the elastic layer formed by the assembly can remain stable, and the elastic units can be easily removed from the elastic layer for replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG1 is a perspective view of embodiment 1 of the present invention;

[0042] FIG2 is an exploded view of Example 1 of the present invention;

[0043] 3 to 12 are assembly flow charts of the sofa bed in Example 1 of the present invention;

[0044] 13-14 are schematic diagrams of the backrest angle adjustment in Example 1 of the present invention;

[0045] FIG15 is a schematic diagram of an elastic unit in Example 1 of the present invention;

[0046] FIG16 is a schematic diagram of the elastic unit in Example 1 of the present invention from another angle;

[0047] 17-18 are schematic diagrams showing the connection of the elastic unit array in Example 1 of the present invention;

[0048] FIG19 is a schematic diagram of an elastic unit in Example 2 of the present invention;

[0049] FIG20 is a schematic diagram of the elastic unit in Example 2 of the present invention from another angle;

[0050] 21 to 23 are schematic diagrams of the connection of the elastic unit array in Example 2 of the present invention;

[0051] FIG24 is a schematic diagram of an elastic unit in Example 3 of the present invention;

[0052] FIG25 is a schematic diagram of the elastic unit in Example 3 of the present invention from another angle;

[0053] 26-28 are schematic diagrams showing connections of elastic unit arrays in Example 3 of the present invention;

[0054] FIG29 is a schematic diagram of an elastic unit in Example 4 of the present invention;

[0055] FIG30 is a schematic diagram of the elastic unit in Example 4 of the present invention from another angle;

[0056] 31 to 34 are schematic diagrams of the connection of the elastic unit array in Example 4 of the present invention;

[0057] Figures 35 and 36 are partial enlarged views of Figures 32 and 33;

[0058] FIG37 is a schematic diagram of an elastic unit in Example 5 of the present invention;

[0059] FIG38 is a schematic diagram of the elastic unit in Example 5 of the present invention from another angle;

[0060] 39-41 are schematic diagrams of the connection of the elastic unit array in Example 5 of the present invention;

[0061] FIG42 is a schematic diagram of an elastic unit in Example 6 of the present invention;

[0062] FIG43 is a schematic diagram of the elastic unit in Example 6 of the present invention from another angle;

[0063] 44 to 47 are schematic diagrams showing connections of elastic unit arrays in Example 6 of the present invention;

[0064] Figure 48 is an enlarged view of the connection of the elastic unit in Example 6 of the present invention. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0066] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships depicted in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0067] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] The elastic unit described in the present invention comprises a spring, a top seat, a lower cover, and a strap. The spring is nested between the top seat and the lower cover, and the strap is connected between the top seat and the lower cover; this applies a certain preload to the spring. Furthermore, other methods of connecting the top seat and the lower cover, where the spring is nested between the top seat and the lower cover, and the upper seat and the lower cover are also considered elastic units of the present invention.

[0069] Example 1

[0070] 1 to 17 , this embodiment provides a foldable sofa bed, the backrest of which can be laid flat so that the backrest and seat cushion can be combined to form a flat bed. The backrest can also form an angle of less than 180° with the seat cushion to realize the function of a normal sofa.

[0071] To this end, the sofa bed comprises a structural frame, a cushion layer 1 and an elastic layer 2 ; the structural frame is used to support the elastic layer 2 and the cushion layer 1 .

[0072] Specifically, the structural skeleton includes a left armrest 3, a right armrest 4, a bed frame, and a bed board; the bed frame is provided with a first bed frame 5 and a second bed frame 6 arranged in sequence along the width direction of the armrest; the first bed frame 5 is fixedly connected between the left armrest 3 and the right armrest 4; the second bed frame 6 is rotatably connected between the left armrest 3 and the right armrest 4; the bed board is respectively connected to the first bed frame 5 and the second bed frame 6.

[0073] After the above configuration, the first bed frame 5 is fixed to the left and right armrests 3 and 4, serving as the support frame for the seat cushion. The second bed frame 6 can rotate relative to the left and right armrests 3 and 4, thereby changing the angle between the second bed frame 6 and the first bed frame 5, serving as the support frame for the backrest.

[0074] By limiting the rotational travel of the second bed frame 6, the second bed frame 6 can have a first position and a second position relative to the first bed frame 5. When the second bed frame 6 is in the first position, the angle between the first bed frame 5 and the second bed frame 6 is 180°; when the second bed frame 6 is in the second position, the angle between the first bed frame 5 and the second bed frame 6 is less than 180°.

[0075] In this embodiment, a rotational connection is to be achieved between the second bed frame 6 and the left armrest 3 and the right armrest 4. The left armrest 3 and the right armrest are rotationally connected to the second bed frame 6 via a folding hinge 7 respectively; the folding hinge 7 includes a first arm 71 and a second arm 72 hingedly connected at one end; the other end of the first arm 71 is fixedly connected to the left armrest 3 or the right armrest 4, and the other end of the second arm 72 is fixedly connected to the second bed frame 6.

[0076] In this embodiment, the second bed frame 6 must be secured in the second position to function properly as a sofa. To this end, a locking mechanism is included to secure the relative positions of the first and second bed frames 5 and 6. Specifically, the locking mechanism includes a ratchet 73 disposed on one of the first and second arms 71 and 72, and a pawl 74 disposed on the other of the first and second arms 71 and 72. The ratchet 73 is circumferentially provided with ratchet teeth, and the pawl 74 engages with the ratchet teeth to secure the second bed frame 6 in its current position.

[0077] If you want to achieve multi-level adjustment of the backrest angle, you can increase the number of ratchets, so that when the pawl 74 engages with different ratchets, you can change the position of the second bed frame 6, thereby achieving multi-level adjustment of the backrest angle.

[0078] To enhance the stability of the entire frame structure, the left and right armrests 3 and 4 are fixedly connected by a crossbar 8. Crossbar 8 is located on one side of the left and right armrests 3 and 4, near the backrest. A support leg 81 extends downward from the middle of crossbar 8, providing a new support point in contact with the ground.

[0079] Since the second bed frame 6 is flush with the first bed frame 5 when the second bed frame 6 is in the first position, it is necessary to prevent the crossbar 8 from interfering with the rotation of the second bed frame 6. Therefore, a recessed portion 82 is provided on the crossbar 8. When the second bed frame 6 is in the first position, the portion of the second bed frame 6 that contacts the crossbar 8 is placed in the recessed portion 82, thereby preventing interference between the crossbar 8 and the second bed frame 6.

[0080] In this embodiment, the second bed frame 6 and the first bed frame 5 are each formed by joining two rectangular frames along their length. Therefore, in addition to the rectangular frames surrounding the second bed frame 6, the second bed frame 6 also includes a central longitudinal beam 61. Consequently, there are three recessed portions 82, one for each side of the rectangular frame and the location of the longitudinal beam 61.

[0081] Because the first and second bed frames 5 and 6 are merely frames and cannot support the elastic layer 2 and cushion layer 1, a bed board must be installed between the first and second bed frames 5 and 6. In this embodiment, the bed board is a steel mesh interwoven horizontally and vertically. To accommodate the steel mesh, the first and second bed frames 5 and 6 are provided with insertion holes 51 and 62 along the longitudinal sides thereof, respectively, for securing the steel mesh.

[0082] To ensure the stability of the bed board, the holes 51 and 62 are arranged in different directions. This allows the wire mesh to be fixed in both the vertical and horizontal directions, thereby ensuring the stability of the wire mesh. Specifically, the inner surface of the frame on the opposite side of the first bed frame 5 and the second bed frame 6 is provided with the holes 51 and 62 at intervals; the upper surface of the frame on the side facing the first bed frame 5 and the second bed frame 6 is provided with the holes 51 and 62 at intervals.

[0083] Correspondingly, the bed board includes multiple steel meshes 9; horizontally extending latches 91 are provided on one side of the steel meshes 9, while vertically extending latches 91 are provided on the other side. Alternatively, horizontal and vertical latches 91 may be provided on the same side. By inserting the latches 91 extending in different directions into the corresponding insertion holes 51 and 62 extending in different directions, the steel meshes can be stably fixed within the first and second bed frames 5 and 6.

[0084] The function of the wire mesh is to support and mount the elastic layer 2. To this end, the surface of the bed mesh unit 9 is provided with a plurality of fixing members 92 for fixing the elastic layer 2. The elastic layer 2 comprises a plurality of elastic units 21 arranged in an array, and the bottom of each elastic unit 21 is provided with a corresponding fixing member 210 that cooperates with the fixing member 92. In this embodiment, the fixing member 92 is a straight-line protrusion extending along the height direction of the steel wire. The fixing member 210 is a straight-line slot. By interlocking the two, the elastic unit 21 and the grid-like bed board unit 9 can be fixed.

[0085] In this embodiment, the insertion of the I-shaped protrusion and the I-shaped slot of the fixed fitting 210 is a weak connection, which is used to further stabilize the elastic layer 2 and prevent the elastic units 21 from moving. At the same time, it is used to connect multiple elastic units 21 to form the elastic layer 2, realize the rapid disassembly and assembly of the elastic units 21, and facilitate the user to replace the elastic units 21. The upper end of the elastic unit 21 is provided with four first connecting members 211. The first connecting members 211 of two adjacent elastic units are connected by an intermediate connecting member 213, which connects the first connecting members 211 of adjacent elastic units 21 together.

[0086] As a simple alternative to this embodiment, the bottom of the elastic unit 21 can also be fixed to the bed board 9 by other means, such as bolts and nuts. When the elastic unit 21 is locked to the bed board, the connection between the two is very stable, so the upper ends of adjacent elastic units can be connected or not.

[0087] In addition, the bed frame can also be provided with fixing parts to be weakly connected with the elastic unit 21, or directly locked.

[0088] In this embodiment, the intermediate connector 213 is plug-in connected to the first connector 211. The first connector 211 is a slot, and the intermediate connector 213 includes a connecting strip and plugs disposed at both ends of the connecting strip.

[0089] The advantage of setting up such an intermediate connecting piece 213 is that the cushion layer 1 and the elastic layer 2 can be connected together through the intermediate connecting piece 213 to avoid relative movement between the cushion layer 1 and the elastic layer 2. Therefore, a plurality of second slots 11 are set along the circumferential intervals on the lower surface of the cushion layer 1, and the second slots 11 and the slots on the elastic unit 21 outside the elastic layer 2 can be fixedly connected together through the intermediate connecting piece 213.

[0090] Example 2

[0091] Referring to Figures 19-23, in order to connect multiple elastic units 21 to form an elastic layer 2, the elastic unit 21 in this embodiment is symmetrically provided with two first connecting members 211 and two second connecting members 212 around its own axial direction; the first connecting members 211 and the second connecting members 212 are alternately arranged; in this way, two adjacent elastic units 21 are connected through the first connecting members 211 and the second connecting members 212.

[0092] In this embodiment, the first connecting member 211 and the second connecting member 212 are plug-in connections.

[0093] To achieve the aforementioned plug-in connection, the first connector 211 is an insert, and the second connector 212 is a slot that cooperates with the first connector 211. To facilitate the release of the plug-in connection between multiple elastic units 21, the insert is provided with an elastic arm 2111 on its surface, and a protrusion 2112 is provided on its surface; the sidewall of the slot is provided with an opening 2121 that cooperates with the protrusion 2112 in a limiting manner; when the elastic arm 2111 is in its initial position, the protrusion 2112 is placed in the opening 2121 and cooperates with the opening 2121 in a direction opposite to the plug-in direction. To release the plug-in connection, simply press the protrusion 2112 to release the limiting cooperation between the protrusion 2112 and the opening 2121, thereby releasing the connection between the insert and the slot.

[0094] Example 3

[0095] Referring to Figures 24-28, the main difference between this embodiment and Example 2 lies in the different structures of the first connecting member 211 and the second connecting member 212. In this embodiment, the first connecting member 211 and the second connecting member 212 are also connected by plugging, but the difference is that: an elastic arm 2111 is provided on each side of the plug block, and the side of the elastic arm 2111 away from the plug block has a protrusion 2112; the two side walls of the slot along the length direction are respectively provided with openings 2121 that engage with the protrusions 2112 in a limited manner; when the elastic arm 2111 is in the initial position, the protrusion 2112 is placed in the opening 2121 and engages with the opening 2121 in a direction opposite to the plugging direction.

[0096] When unlocking, the connection between the plug and the slot can be released by pressing the protrusions 2112 on both sides to release the limiting fit between the protrusions 2112 and the openings 2121.

[0097] Example 4

[0098] Referring to Figures 29-36, this embodiment differs from Example 2 in that, unlike the plug-in connection in Example 1, this embodiment employs a rotational plug-in connection between the first connector 211 and the second connector 212. That is, in addition to being inserted into the second connector 212, the first connector 211 must also be rotated relative to the second connector 212 by a certain angle before the first connector 211 and the second connector 212 can be securely connected.

[0099] To this end, the first connecting member 211 is a rotating block extending along the height direction, and the second connecting member 212 is a limiting groove cooperating with the rotating block; the rotating block has a first position and a second position relative to the limiting groove, and when the rotating block is in the first position, the rotating block and the limiting groove are released from the limiting cooperation in the direction opposite to the direction in which the rotating block is inserted into the limiting groove; when the rotating block is in the second position, the rotating block and the limiting groove are limitedly cooperated in the direction opposite to the direction in which the rotating block is inserted into the limiting groove.

[0100] Specifically, the limiting groove is a strip groove; the length of the rotating block is less than the length of the limiting groove and greater than the width of the limiting groove. The surface of the first connecting member 211 is also provided with an operating portion for driving the rotating block to rotate.

[0101] During installation, first insert the rotating block into the limiting slot from top to bottom in the height direction. At this time, the rotating block is in the first position. Since the length of the rotating block is less than the length of the limiting slot, in this state, the rotating block and the limiting slot do not have a limiting fit in the insertion direction, and no stable connection is formed between the first connecting member 211 and the second connecting member 212. Then, the rotating block is rotated to the second position through the operating part. At this time, the rotating block has rotated 90°. The length direction of the rotating block corresponds to the width direction of the limiting slot. Since the length of the rotating block is greater than the width of the limiting slot, the rotating block and the limiting slot are limited and fit in the direction opposite to the direction of the rotating block being inserted into the limiting slot. At this time, the first connecting member 211 and the second connecting member 212 form a fixed connection. To unlock, just rotate the rotating block back to the first position through the operating part.

[0102] Example 5

[0103] 37-41 , the main difference between this embodiment and embodiment 1 is that, unlike the plug-in connection between the intermediate connector 213 and the first connector 211 in embodiment 4, the intermediate connector 213 and the first connector 211 in this embodiment are connected by a rotational plug-in connection.

[0104] That is, the intermediate connector 213 needs to be inserted into the first connector 211 first and then rotated a certain angle to achieve a fixed connection between the intermediate connector 213 and the first connector 211. To this end, the first connector 211 is an arc-shaped slot extending along the rotation direction, and the intermediate connector 213 includes a first portion placed in the arc-shaped slot and a second portion 2131 passing through the arc-shaped slot; the diameter of one end of the arc-shaped slot is larger than the second portion 2131, and the diameter of the other end is smaller than the second portion 2131; when the second portion 2131 rotates to one end of the corresponding arc-shaped slot, the connector and the connecting member are disconnected; when the second portion 2131 rotates to the other end of the corresponding arc-shaped slot, the connector and the connecting member are locked in a position opposite to the direction in which the connector is inserted into the connecting member.

[0105] The advantage of this connection method is that one intermediate connection member 213 can be connected to four elastic units 21 , as long as four first parts and second parts 2131 are respectively inserted into different arc-shaped slots.

[0106] Similarly, in order to facilitate the rotation operation, the intermediate connecting member 213 also includes an operating portion on the surface thereof for driving the intermediate connecting member 213 to rotate.

[0107] Example 6

[0108] 42 to 48 , the difference between this embodiment and embodiment 4 is that although the elastic unit 21 in this embodiment is only provided with a first connecting member 211 , an intermediate connecting member is not required, and the fixed connection is achieved directly by docking the first connecting members 211 of the two elastic units 21 .

[0109] To this end, the first connecting member 211 includes an inserting portion and an inserted portion extending along the circumference of the elastic unit 21 ; the inserting portions and the inserted portions of two adjacent elastic units 21 form a mating connection.

[0110] Specifically, the inserting portion includes an elastic arm 2113 and a positioning point 2114 disposed on the elastic arm 2113. The inserted portion is provided with a positioning groove 2115 that cooperates with the positioning point 2114. The inserted portion is provided with a clearance opening 2116 for the elastic arm 2111 to swing. Under the action of an external force, the elastic arm 2111 swings along the clearance opening 2116, causing the positioning point 2114 to separate from the positioning groove 2115. Therefore, to unlock the lock, the user simply presses the elastic arm 2113 to separate the positioning point 2114 and the positioning groove 2115.

[0111] The above is only a preferred specific embodiment of the present invention, but the design concept of the present invention is not limited to this. Any technician familiar with this technical field who uses this concept to make non-substantial changes to the present invention within the technical scope disclosed by the present invention shall be deemed to infringe the scope of protection of the present invention. Industrial Applicability

[0112] The present invention provides a connection structure for elastic units of a sofa bed, the sofa bed comprising a left armrest, a right armrest, and a bed frame fixed to the left and right armrests, the bed frame being provided with a plurality of fixing members arranged in an array, the bottom of the elastic unit being locked to the bed frame fixing members; two first connecting members and two second connecting members being provided around the upper portion of the elastic unit; the first and second connecting members being arranged alternately; and adjacent elastic units being connected via the first and second connecting members. The present invention also provides an elastic layer for a sofa bed comprising: a plurality of elastic units arranged in an array; adjacent elastic units being connected via the fixing structure described above. The present invention also provides a sofa bed comprising: a structural frame, a cushion layer, and an elastic layer; the elastic layer being the aforementioned elastic layer; the cushion layer being fixed to the elastic layer, and having industrial applicability.

Claims

1. A connection structure for an elastic unit of a sofa bed, the sofa bed comprising a left armrest, a right armrest, and a bed frame fixed to the left and right armrests, characterized in that: A plurality of fixing members are arranged in an array on the bed frame, and the bottom of the elastic unit is connected to the bed frame fixing member; two first connecting members and two second connecting members are arranged around the upper part of the elastic unit; the first connecting members and the second connecting members are arranged alternately; and two adjacent elastic units are connected via the first connecting members and the second connecting members.

2. The connection structure of the elastic unit of a sofa bed according to claim 1, characterized in that: The first connecting member and the second connecting member are plug-in connections.

3. The connection structure of the elastic unit of a sofa bed according to claim 2, characterized in that: The first connecting member is an inserting block, and the second connecting member is a slot matched with the first connecting member.

4. The connection structure of the elastic unit of a sofa bed according to claim 3, characterized in that: An elastic arm is provided on the surface of the plug block, and a protrusion is provided on the surface of the elastic arm; the side wall of the slot is provided with an opening that is limitedly engaged with the protrusion; when the elastic arm is in the initial position, the protrusion is placed in the opening and is limitedly engaged with the opening opposite to the plug-in direction.

5. The connection structure of the elastic unit of a sofa bed according to claim 3, characterized in that: An elastic arm is provided on each side of the plug block, and a protrusion is provided on the side of the elastic arm away from the plug block; openings are provided on the two side walls of the slot along the length direction to limit the engagement with the protrusion; when the elastic arm is in the initial position, the protrusion is placed in the opening and limits the engagement with the opening in the opposite direction of the plugging.

6. The connection structure of the elastic unit of a sofa bed according to claim 1, characterized in that: The first connecting member and the second connecting member are connected by a rotation plug.

7. The connection structure of the elastic unit of a sofa bed according to claim 6, characterized in that: The first connecting member is a rotating block extending in the height direction, and the second connecting member is a limiting groove cooperating with the rotating block; The rotating block has a first position and a second position relative to the limiting slot. When the rotating block is in the first position, the rotating block and the limiting slot are released from the limiting fit in the direction opposite to the direction in which the rotating block is inserted into the limiting slot; when the rotating block is in the second position, the rotating block and the limiting slot are limitedly fitted in the direction opposite to the direction in which the rotating block is inserted into the limiting slot.

8. The connection structure of the elastic unit of a sofa bed according to claim 6, characterized in that: The limiting groove is a strip-shaped groove; the length of the rotating block is smaller than the length of the limiting groove and larger than the width of the limiting groove.

9. The connection structure of the elastic unit of a sofa bed according to any one of claims 1 to 8, characterized in that: A steel mesh is laid on the bed frame, and the elastic unit array is arranged on the steel mesh.

10. The connection structure of the sofa bed elastic unit according to claim 9, characterized in that The fixing piece is a straight-line protrusion extending along the height direction of the steel wire, and the fixing matching piece is a straight-line slot.

11. A connection structure for an elastic unit of a sofa bed, the sofa bed comprising a left armrest, a right armrest, and a bed frame fixed to the left and right armrests, characterized in that: A plurality of fixing members are arranged in an array on the bed frame, and the bottom of the elastic unit is locked on the bed frame fixing member; four first connecting members are symmetrically arranged around the upper part of the elastic unit; the first connecting members of adjacent elastic units are connected through an intermediate connecting member.

12. The connection structure of the elastic unit of a sofa bed according to claim 11, characterized in that: The intermediate connecting member and the first connecting member are plug-in connected.

13. The connection structure of the elastic unit of a sofa bed according to claim 12, characterized in that: The first connecting member is a slot, and the intermediate connecting member includes a connecting belt and inserting blocks arranged at both ends of the connecting belt.

14. The connection structure of the elastic unit of a sofa bed according to claim 11, characterized in that: The intermediate connecting member and the first connecting member are connected in a rotating plug-in manner.

15. The connection structure of the elastic unit of a sofa bed according to claim 14, characterized in that: The first connecting member is an arc-shaped slot extending along the rotation direction, and the intermediate connecting member includes a first portion placed in the arc-shaped slot and a second portion passing through the arc-shaped slot; The diameter of one end of the arc-shaped slot is larger than the second portion, and the diameter of the other end is smaller than the second portion; When the second part rotates to one end of the corresponding arc-shaped slot, the connection between the connecting piece and the connecting fitting is released; when the second part rotates to the other end of the corresponding arc-shaped slot, the connecting piece and the connecting fitting are limitedly engaged in the direction opposite to the direction in which the connecting piece is inserted into the connecting fitting.

16. The connection structure of the elastic unit of a sofa bed according to claim 15, characterized in that: The intermediate connecting member also includes an operating portion on the surface thereof for driving the intermediate connecting member to rotate.

17. The connection structure of the sofa bed elastic unit according to any one of claims 11 to 16, characterized in that: A bed board is laid on the bed frame, and the elastic unit array is arranged on the bed board and is locked or weakly connected with the bed board.

18. A connection structure for an elastic unit of a sofa bed, the sofa bed comprising a left armrest, a right armrest, and a bed frame fixed to the left armrest and the right armrest, characterized in that A plurality of fixing members are arranged in an array on the bed frame, and the bottom of the elastic unit is connected to the bed frame fixing member; four first connecting members are symmetrically arranged around the upper part of the elastic unit; and the first connecting members of adjacent elastic units are butted together.

19. The connection structure of the elastic unit of a sofa bed according to claim 18, characterized in that: The first connecting member includes an inserting portion and an inserted portion extending along the circumference of the elastic unit; the inserting portions and the inserted portions of two adjacent elastic units form a mating connection.

20. The connection structure of the elastic unit of a sofa bed according to claim 19, characterized in that: The inserting part includes an elastic arm and a positioning card point arranged on the elastic arm; the inserted part is provided with a positioning groove matched with the positioning card point.

21. The connection structure of the elastic unit of a sofa bed according to claim 20, characterized in that: The inserted portion is provided with a clearance opening for the elastic arm to swing; the elastic arm swings along the direction of the clearance opening under the action of external force, so that the positioning card point is separated from the positioning groove.

22. A sofa bed according to any one of claims 1 to 22, characterized in that: The structural skeleton includes a left armrest, a right armrest, a bed frame, a bed board or a steel mesh; the bed frame is sequentially arranged with a first bed frame and a second bed frame along the width direction of the armrest; the first bed frame is fixedly connected between the left armrest and the right armrest; the second bed frame is rotatably connected between the left armrest and the right armrest; the bed board or the steel mesh is respectively laid in the first bed frame and the second bed frame; the second bed frame has a first position and a second position relative to the first bed frame, the second bed frame is in the first position, and the angle between the first bed frame and the second bed frame is 180°; the second bed frame is in the second position, and the angle between the first bed frame and the second bed frame is less than 180°.

23. The sofa bed according to claim 22, characterized in that: The left armrest and the right armrest are rotatably connected to the second bed frame via a folding hinge respectively; The folding hinge includes a first arm and a second arm hingedly connected at one end; the other end of the first arm is fixedly connected to the left armrest or the right armrest, and the other end of the second arm is fixedly connected to the second bed frame.

24. A connection structure for an elastic unit of a sofa bed, comprising a bed frame, a first bed frame and a second bed frame arranged in sequence along the width direction; the second bed frame having a first position and a second position relative to the first bed frame; a steel mesh or a bed board being laid on the bed frame, characterized in that A plurality of fixing parts are arranged in an array on the bed board or the steel mesh, and the bottom of the elastic unit is connected to the fixing parts of the bed board or the steel mesh; connecting parts are arranged around the upper part of the elastic unit; two adjacent elastic units are connected by connecting parts or by a third part.

25. The connection structure of the sofa bed elastic unit according to claim 24, characterized in that The fixing piece is a straight-line protrusion extending along the height direction of the steel wire, and the bottom of the elastic unit is a straight-line slot.

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