Folding mechanism of sofa bed and sofa bed

Abstract

Provided in the present invention is a folding mechanism of a sofa bed. The folding mechanism comprises a left armrest, a right armrest and a bed frame, wherein the bed frame comprises a first bed frame and a second bed frame which are arranged in sequence in a 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 each rotationally connected to the second bed frame respectively by means of a folding hinge; each folding hinge comprises a first support arm and a second support arm which are hinged at one end; the other end of the first support arm is fixedly connected to the left armrest or the right armrest, and the other end of the second support arm is fixedly connected to the second bed frame; and the folding mechanism further comprises a locking mechanism configured to fix the relative position of the first bed frame and the second bed frame. Further provided in the present invention is a sofa bed, comprising a bed board, a mattress layer, an elastic layer, and the folding mechanism as described above, wherein the bed board is connected into the first bed frame and the second bed frame, respectively.

Description

Folding mechanism of sofa bed and sofa bed 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 ratchet and a pawl, a first arm, and a second arm. One end of the first arm is fixedly connected to the ratchet and the other end is fixedly connected to the second bed frame. One end of the second arm is fixedly connected to the left or right armrest, and the other end of the second arm is pivotally connected to the ratchet. The pawl is mounted on the second arm or armrest. The ratchet is provided with at least two ratchet teeth along its circumference, and the pawl engages with different ratchet teeth to secure the second bed frame in different positions. The ratchet can also be fixed to the second arm and pivotally connected to the first arm, similarly achieving rotational positioning of the second bed frame.

[0008] 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°.

[0009] In some embodiments, the left armrest and the right armrest are fixedly connected via a cross bar.

[0010] In some embodiments, 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 where the crossbar abuts against the second bed frame.

[0011] 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 a first bed frame and a second bed frame.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] In some embodiments, a plurality of fixing members for fixing the elastic layer are arranged at intervals on the surface of the bed board.

[0016] Compared with the prior art, the present invention has the following advantages: by arranging a first bed frame and a second bed frame between the left armrest and the right armrest, the left armrest and the right armrest are respectively rotatably connected to the second bed frame through a folding hinge and a locking structure is provided to form a folding structure, so that the second bed frame can be folded up and down, and the sofa bed can be converted between the bed and sofa states. The folding mechanism has a simple structure and a reasonable position, which is convenient for users to adjust. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a perspective view of embodiment 1 of the present invention;

[0018] FIG2 is an exploded view of Example 1 of the present invention;

[0019] 3 to 12 are assembly flow charts of the sofa bed in Example 1 of the present invention;

[0020] 13-14 are schematic diagrams of the backrest angle adjustment in Example 1 of the present invention;

[0021] FIG15 is a schematic diagram of an elastic unit in Example 1 of the present invention;

[0022] FIG16 is a schematic diagram of the elastic unit in Example 1 of the present invention from another angle;

[0023] 17-18 are schematic diagrams of the connection of the elastic unit array in Example 1 of the present invention; DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Example 1

[0028] 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.

[0029] 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 .

[0030] 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.

[0031] 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.

[0032] 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°.

[0033] 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, one end of which is connected to the hinge 7; the other end of the first arm 71 is fixedly connected to the second bed frame, and the other end of the second arm 72 is fixedly connected to the left armrest 3 or the right armrest 4.

[0034] In this embodiment, the second bed frame 6 must be fixed in the second position to achieve normal sofa function. To this end, the folding hinge includes a ratchet 73 and a pawl 74. The ratchet 73 is pivotally connected to the second arm 72. The first arm 71 is fixedly connected to the ratchet 73. The pawl 74 is mounted on the second arm 72. The ratchet 73 is circumferentially provided with ratchet teeth. The pawl 74 engages with the ratchet teeth to fix the second bed frame 6 in the rotated position. The connection between the ratchet and pawl and the first and second arms can also be reversed as described above, with the first arm pivotally connected to the ratchet, the second arm fixedly connected to the ratchet, and the pawl mounted on the second arm.

[0035] 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.

[0036] 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.

[0037] Since the second bed frame 6 is in the first position, the second bed frame 6 and the first bed frame 5 are aligned, and therefore, 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.

[0038] 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.

[0039] 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 needs to be installed within the first and second bed frames 5 and 6. To install the bed board, the first and second bed frames 5 and 6 are provided with insertion holes 51 and 62, respectively, along the longitudinal sides thereof, for securing the bed board.

[0040] To ensure the stability of the bed board, the holes 51 and 62 are arranged in different directions. This allows the bed board to be limited in both height and horizontal directions, thereby ensuring the stability of the bed board. 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.

[0041] Correspondingly, the bed board includes multiple grid-like bed board units 9; one side of each grid-like bed board unit 9 is provided with a horizontally extending latch 91, and the other side is provided with a vertically extending latch 91. By inserting the latches 91 extending in different directions into the corresponding insertion holes 51 and 62 extending in different directions, the bed board can be stably fixed within the first bed frame 5 and the second bed frame 6.

[0042] The function of the bed board is to support the elastic layer 2. To this end, a plurality of fixing members 92 for fixing the elastic layer 2 are arranged at intervals on the surface of the grid-like bed board unit 9. The elastic layer 2 includes a plurality of elastic units 21 arranged in an array. The bottom of each elastic unit 21 is correspondingly provided with a fixing fitting 210 that cooperates with the fixing member 92. In this embodiment, the fixing member 92 is a straight-line protrusion extending in the height direction. The fixing fitting 210 is a straight-line slot. By plugging the two together, the elastic unit 21 and the grid-like bed board unit 9 can be fixed.

[0043] In order to connect multiple elastic units 21 to form an elastic layer 2, the elastic unit 21 is provided with four first connecting members 211 symmetrically arranged around its own axial direction. The first connecting members 211 of two adjacent elastic units are connected by an intermediate connecting member 213, and the intermediate connecting member 213 connects the first connecting members 211 of adjacent elastic units 21 together.

[0044] 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.

[0045] 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.

[0046] 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

[0047] 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 sequentially along the width direction of the armrest; the first bed frame is fixedly connected between the left and right armrests; the second bed frame is rotatably connected between the left and right armrests; the left and right armrests are each rotatably connected to the second bed frame via a folding hinge; the folding hinge comprises 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 or right armrest, and the other end of the second arm is fixedly connected to the second bed frame; and a locking mechanism is further provided for fixing the relative positions of the first and second bed frames. The present invention also provides a sofa bed, comprising: a bed board, a cushion layer, and an elastic layer; and the folding mechanism described above; the bed board is respectively connected to the first and second bed frames, and has industrial applicability.

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 ratchet and a pawl, a first arm and a second arm, one end of the first arm is fixedly connected to the ratchet, and the other end is fixedly connected to the second bed frame, one end of the second arm is fixedly connected to the left armrest or the right armrest, the other end of the second arm is pivotally connected to the ratchet, the pawl is pivotally connected to the second arm or the armrest, and rests on the ratchet; or: one end of the first arm is pivotally connected to the ratchet, and the other end is fixedly connected to the second bed frame, one end of the second arm is fixedly connected to the left armrest or the right armrest, the other end of the second arm is fixedly connected to the ratchet, and the pawl is pivotally connected to the second arm.

2. 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°.

3. 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.

4. The folding mechanism of a sofa bed according to claim 3, characterized in that: The second bed frame is located at the first position, and the cross bar is provided with a recessed portion at a position corresponding to the position where the cross bar abuts against the second bed frame.

5. 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 4; The bed boards are connected to the first bed frame and the second bed frame respectively.

6. The sofa bed according to claim 5, 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.

7. The sofa bed according to claim 6, 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.

8. The sofa bed according to claim 7, 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.

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