Folding mechanism of sofa bed and sofa bed

Abstract

The invention provides a folding mechanism of a sofa bed. The folding mechanism comprises a left armrest, a right armrest and a bed frame, the bed frame comprises a first bed frame and a second bed frame which are sequentially arranged in the width direction of the armrests; the first bed frame is fixedly connected between the left armrest and the right armrest; the second bed frame is rotationally connected between the left armrest and the right armrest; the left armrest and the right armrest are rotationally connected with the second bed frame through folding hinges respectively; the folding hinge comprises a first support arm and a second support arm of which one ends are hinged; the other end of the first support arm is fixedly connected with the left armrest or the right armrest, and the other end of the second support arm is fixedly connected with the second bed frame; the bed further comprises a locking mechanism, and the locking mechanism is used for fixing the relative positions of the first bed frame and the second bed frame. The invention further provides a sofa bed. The sofa bed comprises a bed board, a cushion layer and an elastic layer, and the folding mechanism. And the bed plates are respectively connected in the first bed frame and the second bed frame.

Description

Technical Field

[0001] The present invention relates to a piece of furniture, in particular to a sofa bed. Background Art

[0002] 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.

[0003] 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

[0004] The main technical problem to be solved by the present invention is to provide a folding mechanism for a sofa bed, which has a simple structure and a reasonable position, and is convenient for users to adjust.

[0005] In order to solve the above technical problems, the present invention provides a folding mechanism for a sofa bed, comprising: a left armrest, a right armrest, and a bed frame; the bed frame comprises a first bed frame and a second bed frame arranged in sequence 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;

[0006] The left armrest and the right armrest are rotatably connected to the second bed frame via a folding hinge respectively;

[0007] 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;

[0008] The bed frame further includes a locking mechanism for fixing the relative positions of the first bed frame and the second bed frame.

[0009] In some embodiments, the locking mechanism includes a ratchet provided on one of the first arm and the second arm, and a pawl provided on the other of the first arm and the second arm; the ratchet is provided with at least two ratchet teeth along the circumference, and the pawl is engaged with different ratchet teeth to fix the second bed frame in different positions.

[0010] 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°.

[0011] In some embodiments, the left armrest and the right armrest are fixedly connected via a cross bar.

[0012] In some embodiments, when the second bed frame is in the first position, a recessed portion is provided at a position of the crossbar corresponding to the position where the crossbar abuts against the second bed frame.

[0013] The present invention also provides a sofa bed, comprising: a bed board, a cushion layer and an elastic layer; and the folding mechanism as described above; the bed board is respectively connected to the first bed frame and the second bed frame.

[0014] In some embodiments, both side edges of the first bed frame and the second bed frame along the length direction are respectively provided with insertion holes for fixing the bed board.

[0015] In some embodiments, the inner surface of the frame on the opposite side of the first bed frame and the second bed frame is provided with the insertion holes at intervals; the upper surface of the frame on the opposite side of the first bed frame and the second bed frame is provided with the insertion holes at intervals.

[0016] In some embodiments, the bed board includes a plurality of grid-shaped bed board units; one side of the grid-shaped bed board unit is provided with a latch extending in a horizontal direction, and the other side is provided with a latch extending in a height direction.

[0017] In some embodiments, the bed board is divided into a first bed board connected to the first bed frame, and a second bed board connected to the second bed frame.

[0018] In some embodiments, the left armrest and the right armrest extend toward each other to form support rods for supporting the first bed frame;

[0019] The support rod is provided with a first connecting groove, and the first bed frame is provided with a first connecting column that matches the first connecting groove.

[0020] In some embodiments, the first connecting groove is divided into a first part and a second part that are interconnected;

[0021] A flange is radially extended outward from the end of the first connecting column. The diameter of the first portion is larger than the flange, and the diameter of the second portion is smaller than the flange.

[0022] In some embodiments, the sides of the first bed frame and the second bed frame are connected to the first bed board and the second bed board respectively by screws.

[0023] In some embodiments, the second arm extends from one end away from the first arm to form a support surface for supporting the second bed board;

[0024] The support surface is provided with a second connecting groove, and the second bed frame is provided with a second connecting column matched with the second connecting groove.

[0025] In some embodiments, the second connecting groove is divided into a first part and a second part that are interconnected;

[0026] A flange is radially extended outward from the end of the second connecting column. The diameter of the first portion is larger than the flange, and the diameter of the second portion is smaller than the flange.

[0027] In some embodiments, the bed board also includes a third bed board connected to the first bed board, the third bed board is connected to the side of the first bed board close to the second bed board, and is set at an obtuse angle to the first bed board; the end of the third bed board is set to be connected to the elastic unit on the side of the first bed board close to the second bed board.

[0028] In some embodiments, the first bed board and the second bed board respectively include two sub-bed boards, and the two sub-bed boards are connected by a hinge so that the bed board can have two states: unfolded and folded.

[0029] Some of the embodiments further include a middle leg for supporting the bed board, and the two sub-bed boards of the first bed board are respectively provided with connecting lugs on the opposite sides; when the bed board is in the unfolded state, the connecting lugs of the two sub-bed boards are staggered in the height direction so that the connecting holes on the two connecting lugs are aligned; the middle leg has a pin passing through the connecting hole to fix the bed board in the unfolded position.

[0030] In some embodiments, a plurality of fixing connection assemblies for fixing the elastic layer are arranged at intervals on the surface of the bed board, and a connecting matching assembly that matches the connecting assembly is provided on the side of the elastic layer facing the bed board.

[0031] In some embodiments, the fixing member connecting assembly is a straight-shaped protrusion extending along the height direction.

[0032] In some embodiments, the connecting assembly comprises a fixed cone upper cover and a fixed cone lower cover, which are arranged on the upper and lower sides of the bed plate in the thickness direction, and the fixed cone lower cover is fixedly connected with the fixed cone upper cover through the bed plate; the fixed cone upper cover is conical, and the connecting fitting assembly is a conical hole.

[0033] In some embodiments, the elastic layer is provided with a plurality of first connecting members spaced along the circumferential direction, and the lower surface of the cushion layer is provided with a plurality of second connecting members spaced along the circumferential direction; the first connecting member and the second connecting member are connected through an intermediate connecting member.

[0034] In some embodiments, the first connecting member and the second connecting member are respectively a slot, and the first connecting member and the second connecting member are connected through an intermediate connecting member.

[0035] In some embodiments, the intermediate connecting member comprises a connecting belt and an insertion block arranged at both ends of the connecting belt.

[0036] In some embodiments, the elastic layer comprises a plurality of elastic units arranged in an array, and adjacent elastic units are connected to form the elastic layer.

[0037] In some embodiments, the elastic unit is provided with the first connecting member along the two sides of the array in the transverse and longitudinal directions, respectively; the first connecting members of adjacent two elastic units are connected through the intermediate connecting member.

[0038] In some embodiments, the cushion layer is fixedly connected with the bed frame.

[0039] Compared with the prior art, the present application has the beneficial effects that by arranging the first bed frame and the second bed frame between the left handrail and the right handrail, the left handrail and the right handrail are respectively connected with the second bed frame through a folding hinge and arranged with locking structure to form a folding structure, so that the second bed frame can be folded up and down at an angle, the sofa bed can be converted between the bed and the sofa state, the folding mechanism structure is simple and reasonable, and the user can conveniently adjust. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is a perspective view of the embodiment 1 of the present application;

[0041] Figure 2 It is an exploded view of the embodiment 1 of the present application;

[0042] Figure 3-Figure 12 It is an assembly flowchart of the sofa bed in the embodiment 1 of the present application;

[0043] Figure 13-14 It is a schematic view of the backrest angle adjustment in the embodiment 1 of the present application;

[0044] Figure 15Schematic diagram of the elastic unit in Example 1 of the present invention;

[0045] Figure 16 This is a schematic diagram of the elastic unit in Example 1 of the present invention from another angle;

[0046] Figure 17-18 This is a schematic diagram of the connection of the elastic unit array in Example 1 of the present invention;

[0047] Figure 19 Schematic diagram of the elastic unit in Example 2 of the present invention;

[0048] Figure 20 This is a schematic diagram of the elastic unit in Example 2 of the present invention from another angle;

[0049] Figure 21-23 Schematic diagram of the connection of the elastic unit array in Example 2 of the present invention;

[0050] Figure 24 Schematic diagram of the elastic unit in Example 3 of the present invention;

[0051] Figure 25 This is a schematic diagram of the elastic unit in Example 3 of the present invention from another angle;

[0052] Figure 26-Figure 28 Schematic diagram of the connection of the elastic unit array in Example 3 of the present invention;

[0053] Figure 29 Schematic diagram of the elastic unit in Example 4 of the present invention;

[0054] Figure 30 This is a schematic diagram from another angle of the elastic unit in Example 4 of the present invention;

[0055] Figures 31-34 This is a schematic diagram of the connection of the elastic unit array in Example 4 of the present invention;

[0056] Figure 35-Figure 36 for Figure 32 and Figure 33 A partial enlarged view of

[0057] Figure 37 Schematic diagram of the elastic unit in Example 5 of the present invention;

[0058] Figure 38 This is a schematic diagram of the elastic unit in Example 5 of the present invention from another angle;

[0059] Figures 39-41 This is a schematic diagram of the connection of the elastic unit array in Example 5 of the present invention;

[0060] Figure 42 Schematic diagram of the elastic unit in preferred embodiment 6 of the present invention;

[0061] Figure 43 This is a schematic diagram from another angle of the elastic unit in the preferred embodiment 6 of the present invention;

[0062] Figures 44-47 Schematic diagram of the connection of the elastic unit array in the preferred embodiment 6 of the present invention;

[0063] Figure 48 This is an enlarged view of the connection of the elastic unit in the preferred embodiment 6 of the present invention;

[0064] Figure 49 This is an exploded view of the connection between the elastic unit and the bed board in Example 7 of the present invention;

[0065] Figure 50 This is a partial exploded view of the connection between the elastic unit and the bed board in Example 7 of the present invention;

[0066] Figure 51 This is a partial exploded side view of the connection between the elastic unit and the bed board in Example 7 of the present invention;

[0067] Figure 52 This is a partial side sectional view of the connection between the elastic unit and the bed board in Example 7 of the present invention;

[0068] Figure 53 Schematic diagram of a bed board in Example 7 of the present invention;

[0069] Figure 54 This is a schematic diagram of the bed board in the folded position in Example 8 of the present invention;

[0070] Figure 55 Schematic diagram of the bed board in the unfolded position in Example 8 of the present invention;

[0071] Figures 56-60 This is a schematic diagram of the installation of the structural frame of the sofa bed in the preferred embodiment 8 of the present invention;

[0072] Figure 61 This is an appearance diagram of a sofa bed in Example 8 of the present invention;

[0073] Figure 62 This is an appearance diagram of the sofa bed in Example 8 of the present invention from another angle;

[0074] Figure 63 This is a schematic diagram of fixing the cushion layer in the preferred embodiment 9 of the present invention. DETAILED DESCRIPTION

[0075] 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.

[0076] 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.

[0077] 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.

[0078] Example 1

[0079] refer to Figures 1-17 This embodiment provides a foldable sofa bed, the backrest of the sofa bed can be laid flat so that the backrest and the seat cushion can be combined to form a flat bed. The backrest can also form an angle less than 180° with the seat cushion to realize the function of a normal sofa.

[0080] 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 .

[0081] 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.

[0082] After the above setting, the first bed frame 5 is in a fixed state with the left armrest 3 and the right armrest 4, corresponding to the support framework of the seat cushion part. The second bed frame 6 can rotate relative to the left armrest 3 and the right armrest 4, thereby changing the included angle between the first bed frame 5 and the second bed frame 6, corresponding to the support framework of the backrest part.

[0083] By limiting the rotation stroke 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 included 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 included angle between the first bed frame 5 and the second bed frame 6 is less than 180°.

[0084] In this embodiment, the rotational connection between the second bed frame 6 and the left armrest 3 and the right armrest 4 is achieved. The left armrest 3 and the right armrest are respectively rotatably connected to the second bed frame 6 through a folding hinge 7. The folding hinge 7 includes a first branch 71 and a second branch 72 rotatably connected at one end. The other end of the first branch 71 is fixedly connected to the left armrest 3 or the right armrest 4, and the other end of the second branch 72 is fixedly connected to the second bed frame 6.

[0085] In this embodiment, the second bed frame 6 needs to be fixed in the second position to achieve normal sofa function. Therefore, a locking mechanism is also included for fixing the relative position of the first bed frame 5 and the second bed frame 6. Specifically, the locking mechanism includes a ratchet 73 provided on one of the first branch 71 and the second branch 72, and a pawl 74 provided on the other one of the first branch 71 and the second branch 72. The ratchet 73 is provided with ratchet teeth along the circumference, and the pawl 74 is engaged with the ratchet teeth to fix the second bed frame 6 in the current position.

[0086] If multi-gear adjustment of the backrest angle is to be achieved, the number of ratchet teeth can be increased. When the pawl 74 is engaged with different ratchet teeth, the position of the second bed frame 6 can be changed, thereby achieving multi-gear adjustment of the backrest angle.

[0087] In order to increase the stability of the entire framework structure, the left armrest 3 and the right armrest 4 are fixedly connected through a cross bar 8. The cross bar 8 is arranged on the side of the left armrest 3 and the right armrest 4 close to the backrest part. The middle part of the cross bar 8 extends downward along the height direction to form a support leg 81, which abuts against the ground to provide a new support point.

[0088] Since the second bed frame 6 is in the first position and the second bed frame 6 and the first bed frame 5 are in the flush state, the rotation of the crossbar 8 to the second bed frame 6 is avoided. Therefore, the crossbar 8 is provided with a recess 82, and when the second bed frame 6 is in the first position, the part of the second bed frame 6 abutting against the crossbar 8 is located in the recess 82, thereby avoiding the interference between the crossbar 8 and the second bed frame 6.

[0089] In the embodiment, the second bed frame 6 and the first bed frame 5 are respectively two rectangular frames butted along the length direction. Therefore, the second bed frame 6 further includes a middle longitudinal beam 61 in addition to the rectangular frames around the periphery. Therefore, the recess 82 also corresponds to three positions corresponding to the two sides of the rectangular frame and the position of the longitudinal beam 61.

[0090] Since the first bed frame 5 and the second bed frame 6 are only one frame, the support to the elastic layer 2 and the cushion layer 1 cannot be achieved, and therefore the bed plate needs to be installed in the first bed frame 5 and the second bed frame 6. In order to install the bed plate, the two side frames of the first bed frame 5 and the second bed frame 6 along the length direction are respectively provided with the insertion hole 51, 62 for fixing the bed plate.

[0091] In order to ensure the stability of the bed plate, the insertion hole 51, 62 is arranged in different directions, so that the bed plate can be limited in the height direction and the horizontal direction, thereby ensuring the stability of the bed plate. Specifically, the inner side surface of the side frame of the first bed frame 5 and the second bed frame 6 on the opposite side is provided with the insertion hole 51, 62 at intervals; and the upper side surface of the side frame of the first bed frame 5 and the second bed frame 6 on the same side is provided with the insertion hole 51, 62 at intervals.

[0092] Correspondingly, the bed plate includes a plurality of grid-shaped bed plate units 9; one side of the grid-shaped bed plate unit 9 is provided with an insertion pin 91 extending along the horizontal direction, and the other side is provided with an insertion pin 91 extending along the height direction. By inserting the insertion pin 91 extending in different directions into the insertion hole 51, 62 extending in different directions, the bed plate can be stably fixed in the first bed frame 5 and the second bed frame 6.

[0093] The function of the bed plate is to support the elastic layer 2, and therefore the surface of the grid-shaped bed plate unit 9 is provided with a plurality of connection assemblies 92 for fixing the elastic layer 2 at intervals. The elastic layer 2 includes a plurality of elastic units 21 arranged in an array, and the bottom of each elastic unit 21 is provided with a fixed fitting part 210 matched with the connection assembly 92. In the embodiment, the connection assembly 92 is a linear protrusion extending along the height direction. The fixed fitting part 210 is a linear slot. By the insertion of the two, the elastic unit 21 and the grid-shaped bed plate unit 9 can be fixed.

[0094] In order to connect the plurality of elastic units 21 to form the elastic layer 2, the elastic unit 21 is provided with four first connecting pieces 211 which are rotationally symmetrical around the self-axis, and the first connecting pieces 211 of two adjacent elastic units are connected by an intermediate connecting piece 213 which connects the first connecting pieces 211 of the adjacent elastic units 21 together.

[0095] In the embodiment, the intermediate connecting piece 213 is connected with the first connecting piece 211 in a plug-in connection. The first connecting piece 211 is a plug-in slot, and the intermediate connecting piece 213 comprises a connecting band and plug-in blocks arranged at both ends of the connecting band.

[0096] The advantage of arranging the intermediate connecting piece 213 is that the intermediate connecting piece 213 can also be used to connect the cushion layer 1 and the elastic layer 2 together, avoiding the relative movement between the cushion layer 1 and the elastic layer 2. Therefore, a plurality of second plug-in slots 11 are arranged on the lower surface of the cushion layer 1 along the circumferential direction, and the second plug-in slots 11 and the plug-in slots on the elastic units 21 outside the elastic layer 2 can be fixedly connected together by the intermediate connecting piece 213.

[0097] Embodiment 2

[0098] Reference Figures 19-23 In order to connect the plurality of elastic units 21 to form the elastic layer 2, the elastic unit 21 is provided with two first connecting pieces 211 and two second connecting pieces 212 which are rotationally symmetrical around the self-axis in the embodiment; the first connecting pieces 211 and the second connecting pieces 212 are arranged alternately; and thus two adjacent elastic units 21 are connected by the first connecting pieces 211 and the second connecting pieces 212.

[0099] In the embodiment, the first connecting piece 211 and the second connecting piece 212 are connected in a plug-in connection.

[0100] In order to realize the plug-in connection, the first connecting piece 211 is a plug-in block, and the second connecting piece 212 is a plug-in slot matched with the first connecting piece 211. In order to facilitate the disconnection of the plug-in connection between the plurality of elastic units 21, an elastic arm 2111 is arranged on the surface of the plug-in block, and a protrusion 2112 is arranged on the surface of the elastic arm 2111; an opening 2121 matched with the protrusion 2112 is arranged on the side wall of the plug-in slot; when the elastic arm 2111 is in the initial position, the protrusion 2112 is arranged in the opening 2121 and matched with the opening 2121 in the limit direction opposite to the plug-in direction. When the plug-in connection is to be disconnected, the protrusion 2112 is pressed to disconnect the limit matching between the protrusion 2112 and the opening 2121, and thus the connection between the plug-in block and the plug-in slot is disconnected.

[0101] Embodiment 3

[0102] Reference Figures 24-28The main difference between the embodiment and the embodiment 2 is the structure of the first connecting member 211 and the second connecting member 212. In the embodiment, the first connecting member 211 and the second connecting member 212 are also connected by plug-in connection, but the difference is that an elastic arm 2111 is arranged 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 plug-in slot along the length direction are respectively provided with an opening 2121 for limiting cooperation with the protrusion 2112; when the elastic arm 2111 is in the initial position, the protrusion 2112 is placed in the opening 2121 and is limited and matched with the opening 2121 against the plug-in direction.

[0103] When unlocked, as long as the protrusions 2112 on both sides are pressed to release the limiting cooperation of the protrusions 2112 and the openings 2121, the connection relationship between the plug block and the plug-in slot can be released.

[0104] Embodiment 4

[0105] Reference Figures 29-36 In the embodiment, the difference between the embodiment and the embodiment 2 is that, unlike the plug-in connection in the embodiment 1, the first connecting member 211 and the second connecting member 212 in the embodiment are rotatably and plug-in connected. That is, in addition to being inserted into the second connecting member 212, the first connecting member 211 also needs to be rotated at a certain angle relative to the second connecting member 212, and then the first connecting member 211 and the second connecting member 212 can be fixedly connected.

[0106] 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 slot matched with the rotating block; the rotating block has a first position and a second position relative to the limiting slot, the rotating block is in the first position, and the rotating block and the limiting slot are released from the limiting cooperation against the direction of the rotating block inserted into the limiting slot; when the rotating block is in the second position, the rotating block and the limiting slot are limited and matched against the direction of the rotating block inserted into the limiting slot.

[0107] Specifically, the limiting slot is a strip-shaped slot; the length of the rotating block is less than the length of the limiting slot and greater than the width of the limiting slot. The surface of the first connecting member 211 is also provided with an operation part for driving the rotating block to rotate.

[0108] When installing, the rotating block is inserted into the limiting groove from top to bottom in the height direction, and at this time the rotating block is located at the first position. Since the length of the rotating block is less than the length of the limiting groove, there is no limiting fit between the rotating block and the limiting groove at this time, and the first connecting piece 211 and the second connecting piece 212 are not in fixed connection. Then the rotating block is rotated to the second position through the operation part, and at this time the rotating block is rotated by 90°, and the length direction of the rotating block corresponds to the width direction of the limiting groove. Since the length of the rotating block is greater than the width of the limiting groove, the rotating block and the limiting groove are limited and fitted in the direction opposite to the insertion of the rotating block into the limiting groove. At this time, the first connecting piece 211 and the second connecting piece 212 form a fixed connection. When unlocking, the rotating block is rotated to the first position again through the operation part.

[0109] Embodiment 5

[0110] Reference Figures 37-41 The main difference between this embodiment and embodiment 1 is that the difference between the plug-in connection of the intermediate connecting piece 213 and the first connecting piece 211 in embodiment 4, and in this embodiment, the intermediate connecting piece 213 and the first connecting piece 211 are in rotational plug-in connection.

[0111] That is, the intermediate connecting piece 213 needs to be inserted into the first connecting piece 211 first, and then rotated by a certain angle to realize the fixed connection of the intermediate connecting piece 213 and the first connecting piece 211. For this purpose, the first connecting piece 211 is an arc-shaped clamping groove extending in the rotation direction, and the intermediate connecting piece 213 includes a first part placed in the arc-shaped clamping groove and a second part 2131 passing through the arc-shaped clamping groove; one end of the arc-shaped clamping groove has a diameter greater than the second part 2131, and the other end has a diameter less than the second part 2131; when the second part 2131 is rotated to the one end corresponding to the arc-shaped clamping groove, the connecting piece and the connecting fitting are disconnected; when the second part 2131 is rotated to the other end corresponding to the arc-shaped clamping groove, the connecting piece and the connecting fitting are limited and fitted in the direction opposite to the insertion of the connecting piece into the connecting fitting.

[0112] The advantage of this connection mode is that one intermediate connecting piece 213 can correspond to four elastic units 21, as long as four first parts and second parts 2131 inserted into different arc-shaped clamping grooves are correspondingly provided.

[0113] Similarly, in order to facilitate rotation, the intermediate connecting piece 213 also includes a surface provided with an operation part for driving the rotation of the intermediate connecting piece 213.

[0114] Embodiment 6

[0115] Reference Figures 42-48The difference between the embodiment and embodiment 4 is that the elastic unit 21 in the embodiment is provided with only the first connecting piece 211, but does not need to be provided with the intermediate connecting piece, and directly relies on the butt joint of the first connecting pieces 211 of the two elastic units 21 to realize the fixed connection.

[0116] To this end, the first connecting piece 211 comprises an insertion portion extending in the circumferential direction of the elastic unit 21 and an inserted portion; the insertion portion and the inserted portion of the two adjacent elastic units 21 form a plug-in.

[0117] Specifically, the insertion portion comprises an elastic arm 2113 and a positioning clamping point 2114 arranged on the elastic arm 2113; the inserted portion is provided with a positioning groove 2115 matched with the positioning clamping point 2114. The inserted portion is provided with a clearance opening 2116 for swinging of the elastic arm 2111; the elastic arm 2111 swings in the direction of the clearance opening 2116 under the action of an external force, so that the positioning clamping point 2114 is separated from the positioning groove 2115. Therefore, when unlocking, only the user needs to press the elastic arm 2113 to drive the positioning clamping point 2114 and the positioning groove 2115 to separate.

[0118] Embodiment 7

[0119] Reference Figures 49-53 Compared with embodiment 1, the embodiment provides another way of fixing the elastic unit 21 on the bed plate 9.

[0120] The bed plate 9 is provided with a connecting assembly 93 for connecting with the elastic unit 21, and the side of the elastic unit 21 facing the bed plate 9 is provided with a connecting matching assembly 214 matched with the connecting assembly.

[0121] In the embodiment, the connecting assembly 93 comprises a fixed cone upper cover 931 and a fixed cone lower cover 932, which are arranged on the upper and lower sides in the thickness direction of the bed plate 9, and the fixed cone lower cover 932 is fixedly connected with the fixed cone upper cover 931 through the bed plate 9; the fixed cone upper cover 931 is conical, and the connecting matching assembly 214 is a conical hole.

[0122] By means of the plug-in and conical surface matching of the conical fixed cone upper cover 931 and the conical hole, the quick assembly of the elastic unit 21 and the bed plate 9 can be realized. To realize the fixation of the fixed cone lower cover 932 and the fixed cone upper cover 931, a plurality of insertion columns 9321 are arranged on the fixed cone lower cover 932, which can be fixedly inserted with the fixed cone upper cover 931 after penetrating through the bed plate 9.

[0123] Embodiment 8

[0124] Reference Figures 54-62Compared with the aforementioned embodiment in which unit boards are spliced ​​together to form a bed board, the bed board 9 in this embodiment is divided into a first bed board 94 connected to the first bed frame 5, and a second bed board 95 connected to the second bed frame 6.

[0125] Furthermore, the first bed board 94 and the second bed board 95 respectively include two sub-bed boards 941 and 951 , which are connected via hinges 944 and 952 so that the first bed board 94 and the second bed board 95 can have two states: unfolded and folded.

[0126] In order to ensure that the first bed board 94 can be fixed in the expanded position, this embodiment also includes a middle leg 96 for supporting the first bed board 94. The two sub-bed boards 941 in the first bed board 94 are respectively provided with connecting lugs 942 on the opposite sides; when the first bed board 94 is in the expanded state, the connecting lugs 942 of the two sub-bed boards 941 are staggered in the height direction so that the connecting holes 943 on the two connecting lugs 942 are aligned; the middle leg 96 has a pin 961 passing through the connecting hole 943 to fix the first bed board 94 in the expanded position.

[0127] In order to install the first bed frame 5 and the second bed frame 6, the left armrest 3 and the right armrest 4 in this embodiment extend support rods 31 and 41 in a direction close to each other for supporting the first bed frame 5; the support rods 31 and 41 are provided with a first connecting groove 311, and the first bed frame 5 is provided with a first connecting column 52 that cooperates with the first connecting groove 311.

[0128] The first connecting groove 311 is divided into a first portion 3111 and a second portion 3112 that communicate with each other. A flange 521 extends radially outward from the end of the first connecting post 52. The diameter of the first portion 3111 is larger than the flange 521, while the diameter of the second portion 3112 is smaller. During installation, the first connecting post 52 of the first bed frame 5 is inserted into the first portion 3111 and then pushed horizontally into the second portion 3112. This allows the flange 521 and the second portion 3112 to engage and complete the installation.

[0129] Similarly, in order to fix the second bed frame 6 and the folding hinge 7, a support surface 721 for supporting the second bed board 95 extends from one end of the second arm 72 away from the first arm 71; a second connecting groove is provided on the support surface 721, and the second bed frame 6 is provided with a second connecting column that cooperates with the second connecting groove.

[0130] The second connecting groove is divided into a first part and a second part which are in communication with each other; the end of the second connecting column extends a flange radially outward; the diameter of the first part is larger than the flange, and the diameter of the second part is smaller than the flange. When installing, the second connecting column of the second bed frame 6 is inserted into the first part, and then the second connecting column is pushed into the second part along the horizontal direction, so that the flange and the second part are limited and matched to complete the installation.

[0131] In addition, the side of the first bed frame 5 and the second bed frame 6 is connected by a screw to the first bed plate 94 and the second bed plate 95, respectively.

[0132] Since the elastic units on the first bed plate 94 and the second bed plate 95 are not connected to each other, the bed plate further comprises a third bed plate 96 connected to the first bed plate 94, the third bed plate 96 is connected to the side of the first bed plate 94 close to the second bed plate 95, and the third bed plate 96 is arranged at an obtuse angle with the first bed plate 94; the end of the third bed plate 96 is connected to the elastic unit 21 on the side of the first bed plate 94 close to the second bed plate 95. In this way, the elastic unit 21 on the side of the first bed plate 94 close to the second bed plate 95 and the third bed plate 96 are connected together to increase stability.

[0133] Embodiment 9

[0134] Reference Figure 62 In this embodiment, the cushion layer 1 and the structural skeleton are fixedly connected, and a connecting card 11 can be arranged on the outer side of the cushion layer 1 along the circumference, and the connecting card 11 is provided with a clamping groove 111 for clamping the pipe of the structural skeleton.

[0135] The above is only a preferred specific embodiment of the present application, but the design concept of the present application is not limited thereto, and any person skilled in the art can make non-essential changes to the present application within the technical scope disclosed by the present application, which is an infringement of the protection scope of the present application.

Claims

1. A folding mechanism for a sofa bed, characterized in that include: Left armrest, right armrest and bed frame; The bed frame comprises a first bed frame and a second bed frame arranged in sequence 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 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; The bed frame further includes a locking mechanism for fixing the relative positions of the first bed frame and the second bed frame.

2. The folding mechanism of a sofa bed according to claim 1, characterized in that: The locking mechanism includes a ratchet provided on one of the first arm and the second arm, and a pawl provided on the other of the first arm and the second arm; the ratchet is provided with at least two ratchet teeth along the circumference, and the pawl is engaged with different ratchet teeth to fix the second bed frame at different positions.

3. The folding mechanism of a sofa bed according to claim 1, characterized in that: 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°.

4. The folding mechanism of a sofa bed according to claim 2, characterized in that: The left armrest and the right armrest are fixedly connected via a cross bar.

5. The folding mechanism of a sofa bed according to claim 4, characterized in that: When the second bed frame is located at the first position, a recessed portion is provided at a position of the crossbar corresponding to the position abutting against the second bed frame.

6. A sofa bed, characterized in that include: Bed boards, padding and resilient layers; and the folding mechanism according to any one of claims 1 to 5; The bed boards are connected to the first bed frame and the second bed frame respectively.

7. The sofa bed according to claim 6, characterized in that: The first bed frame and the second bed frame are respectively provided with insertion holes for fixing the bed board on both side frames along the length direction.

8. The sofa bed according to claim 7, characterized in that: The inner surfaces of the frames on the opposite sides of the first and second bed frames are provided with the insertion holes at intervals; the upper surfaces of the frames on the opposite sides of the first and second bed frames are provided with the insertion holes at intervals.

9. The sofa bed according to claim 8, characterized in that: The bed board includes a plurality of grid-shaped bed board units; one side of the grid-shaped bed board unit is provided with a latch extending in a horizontal direction, and the other side is provided with a latch extending in a height direction.

10. The sofa bed according to claim 6, characterized in that: The bed board is divided into a first bed board connected to the first bed frame, and a second bed board connected to the second bed frame.

11. The sofa bed according to claim 10, characterized in that: The left armrest and the right armrest extend toward each other to form support rods for supporting the first bed frame; The support rod is provided with a first connecting groove, and the first bed frame is provided with a first connecting column that matches the first connecting groove.

12. The sofa bed according to claim 11, characterized in that: The first connecting groove is divided into a first part and a second part which are interconnected; A flange is radially extended outward from the end of the first connecting column. The diameter of the first portion is larger than the flange, and the diameter of the second portion is smaller than the flange.

13. The sofa bed according to claim 10, characterized in that: The first bed board and the second bed board are connected to each other by screws at the side surfaces of the first bed frame and the second bed frame.

14. The sofa bed according to claim 13, characterized in that: The second arm extends from one end away from the first arm to form a support surface for supporting the second bed board; The support surface is provided with a second connecting groove, and the second bed frame is provided with a second connecting column matched with the second connecting groove.

15. The sofa bed according to claim 14, characterized in that: The second connecting groove is divided into a first part and a second part which are interconnected; A flange is radially extended outward from the end of the second connecting column. The diameter of the first portion is larger than the flange, and the diameter of the second portion is smaller than the flange.

16. The sofa bed according to claim 10, characterized in that: The bed board also includes a third bed board connected to the first bed board, the third bed board is connected to the side of the first bed board close to the second bed board, and is set at an obtuse angle to the first bed board; the end of the third bed board is set to be connected to the elastic unit on the side of the first bed board close to the second bed board.

17. The connection structure of the sofa bed elastic unit according to claim 10, characterized in that: The first bed board and the second bed board respectively include two sub-bed boards, and the two sub-bed boards are connected by a hinge so that the bed board can have two states: unfolded and folded.

18. The connection structure of the sofa bed elastic unit according to claim 17, characterized in that: It also includes a middle leg for supporting the bed board, and the two sub-bed boards of the first bed board are respectively provided with connecting lugs on the opposite sides; when the bed board is in the unfolded state, the connecting lugs of the two sub-bed boards are staggered in the height direction so that the connecting holes on the two connecting lugs are aligned; the middle leg has a pin passing through the connecting hole to fix the bed board in the unfolded position.

19. The sofa bed according to claim 6, characterized in that: A plurality of connecting components for fixing the elastic layer are arranged at intervals on the surface of the bed board, and a connecting and matching component that matches the connecting component is arranged on the side of the elastic layer facing the bed board.

20. The sofa bed according to claim 19, characterized in that: The connecting component is a straight-shaped protrusion extending along the height direction.

21. The sofa bed according to claim 19, characterized in that: The connecting component includes a fixed cone upper cover and a fixed cone lower cover, which are arranged on the upper and lower sides of the bed board in the thickness direction, and the fixed cone lower cover passes through the bed board and is fixedly connected to the fixed cone upper cover; the fixed cone upper cover is conical, and the connecting matching component is a conical hole.

22. The sofa bed according to claim 6, characterized in that: The elastic layer is provided with a plurality of first connecting members spaced apart along the circumferential direction, and the lower surface of the cushion layer is provided with a plurality of second connecting members spaced apart along the circumferential direction; the first connecting members and the second connecting members are connected through an intermediate connecting member.

23. The sofa bed according to claim 22, characterized in that: The first connecting member and the second connecting member are respectively slots, and the first connecting member and the second connecting member are connected via an intermediate connecting member.

24. The sofa bed according to claim 23, characterized in that: The intermediate connecting piece includes a connecting belt and inserting blocks arranged at both ends of the connecting belt.

25. The sofa bed according to claim 22, characterized in that: The elastic layer includes a plurality of elastic units arranged in an array, and adjacent elastic units are connected to each other to form the elastic layer.

26. The sofa bed according to claim 25, characterized in that: The elastic units are respectively provided with the first connecting members on both sides of the array in the transverse direction and the longitudinal direction; the first connecting members of two adjacent elastic units are connected via the intermediate connecting member.

27. The sofa bed according to claim 6, characterized in that: The cushion layer is fixedly connected to the bed frame.

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