Folding mechanism of armless sofa bed, and sofa bed having same

Abstract

Provided in the present invention is a folding mechanism of an armless sofa bed, the folding mechanism comprising a bed support and a bed frame; the bed support comprises a left cross rod and a right cross rod; the bed frame is sequentially provided with a first bed frame and a second bed frame in the width direction of the cross rods; the first bed frame is locked between the left cross rod and the right cross rod; the second bed frame is rotatably connected between the left cross rod and the right cross rod; the left cross rod and the right cross rod are each rotatably connected to the second bed frame by means of a folding hinge; each folding hinge comprises a first support arm and a second support arm hinged to each other at one end thereof; the other end of the first support arm is fixedly connected to the left cross rod or the right cross rod, and the other end of the second support arm is locked to the second bed frame; each folding hinge comprises a locking mechanism, which is used for fixing the relative position of the first bed frame and the second bed frame.

Description

A folding mechanism for an armless sofa bed and the sofa bed thereof

[0001] Cross-references to related applications

[0002] This application claims priority to and is based on Chinese Patent Application No. 202510318011.2, filed on March 18, 2025, with the invention title "A Folding Mechanism for an Armless Sofa Bed and the Sofa Bed Thereof", the contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to a type of furniture, and more particularly to a folding mechanism for an armless sofa bed and the sofa bed thereof. Background Technology

[0004] As people's material living standards gradually improve, residents' demands for furniture and household goods are also becoming more diversified. Among them, sofa beds have become a popular furniture product. However, existing sofa beds have some shortcomings, such as: the switching between the two modes is not smooth enough, and it is often difficult for operators with less strength to do it alone; existing sofa beds may not be stable enough when used as a sofa, and the angle between the seat and backrest may change, affecting comfort; and existing folding beds have relatively simple folding methods, which cannot meet the diverse needs of users.

[0005] Even if the aforementioned problems could be solved, current sofa beds still have many shortcomings in details. For example, the cushions and elastic layers are prone to relative movement during use; the base support structure of armless sofa beds cannot rotate to support both the backrest frame supporting the sofa structure and the main frame supporting the bed structure, requiring the folding hinges to be installed on the armrests in previous designs; the installation method between the backrest frame and the bed frame is unreasonable; it is not possible to disassemble and fold the various components of the sofa bed; and if spring modules are present, their installation method is usually not reasonable. Summary of the Invention

[0006] The main technical problem to be solved by the present invention is to provide a folding mechanism for an armless sofa bed and a sofa bed. The folding mechanism has a simple structure and a reasonable position, making it convenient for users to adjust.

[0007] To solve the above-mentioned technical problems, the present invention provides a folding mechanism for an armless sofa bed, including a bed frame and a bed frame; the bed frame includes a left crossbar and a right crossbar; the bed frame is provided with a first bed frame and a second bed frame in sequence along the width direction of the crossbar; the first bed frame is locked between the left crossbar and the right crossbar; the second bed frame is rotatably connected between the left crossbar and the right crossbar.

[0008] The left and right crossbars are rotatably connected to the second bed frame via a folding hinge.

[0009] The folding hinge includes a first arm and a second arm hinged at one end; the other end of the first arm is fixedly connected vertically to the left or right crossbar, and the other end of the second arm is fixedly connected to the second bed frame; the height of the first arm is lower than the thickness of the flexible cushion layer of the sofa bed.

[0010] The folding hinge also includes a locking mechanism for fixing the relative positions of the first arm and the second arm.

[0011] The folding hinge includes a ratchet and a pawl. One end of the first arm is fixedly connected to the ratchet, one end of the second arm is pivotally connected to the ratchet, and the pawl is pivotally connected to the second arm and abuts against the ratchet; or: one end of the first arm is pivotally connected to the ratchet, one end of the second arm is fixedly connected to the ratchet, and the pawl is pivotally connected to the first arm.

[0012] 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 included angle between the first bed frame and the second bed frame is 180°. When the second bed frame is in the second position, the included angle between the first bed frame and the second bed frame is less than 180°.

[0013] In some embodiments, when the second bed frame is in the first position, a clearance recess is provided corresponding to the position of the folding hinge.

[0014] In some embodiments, the second support arm is provided with a first connecting part at one end facing the second bed frame; the second bed frame is provided with a second connecting part at one side facing the second support arm, and the first connecting part and the second connecting part are locked together.

[0015] In some embodiments, the second connection includes a sleeve parallel to the direction of the crossbar, the sleeve passing through the first bolt holes on both sides along the thickness direction.

[0016] In some embodiments, the first connection includes a second bolt hole that extends along the second arm.

[0017] In some embodiments, bolts and nuts are also included, wherein when the second arm is connected to the second bed frame, the first connecting portion of the second arm passes through the sleeve, the bolt passes through the first bolt hole and the second bolt hole, and is locked by the nut.

[0018] In some embodiments, the second connection includes a connecting rod perpendicular to the crossbar direction, the connecting rod passing through the first bolt holes on both sides along the thickness direction.

[0019] In some embodiments, the first connecting portion includes a connecting plate disposed at the end of the second arm, with a second bolt hole passing through the connecting plate.

[0020] In some embodiments, bolts and nuts are also included, and when the second arm is connected to the second bed frame, the connecting plate rotates until the first bolt hole and the second bolt hole partially or completely overlap, the bolt passes through the first bolt hole and the second bolt hole, and is locked by the nut.

[0021] The present invention also provides a sofa bed, including the folding mechanism of the sofa bed described above, and further including an elastic layer and a cushion layer, wherein the elastic layer is fixed above the bed frame and the cushion layer is placed above the elastic layer.

[0022] In some embodiments, the bed frame further includes longitudinal bars and first legs, with two first legs connected to the ends of the left and right crossbars respectively; the longitudinal bars are connected to the first legs on the left and right crossbars respectively.

[0023] In some embodiments, the bed frame is provided with a plurality of fasteners for securing the elastic units of the elastic layer.

[0024] In some embodiments, the first bed frame is divided into two sub-bed frames, and the second bed frame is also divided into two sub-bed frames, which are connected to each other to form the first bed frame or the second bed frame.

[0025] In some embodiments, a plurality of second legs are provided below the bed frame.

[0026] In some embodiments, a bed board is also included, through which clearance holes for the fasteners to be exposed and clearance portions for the folding hinges to pass through in the first position.

[0027] Compared with the prior art, the beneficial effects of this invention are that by setting a first bed frame and a second bed frame between the left and right crossbars of the bed frame, and by rotatably connecting the left armrest and the right crossbar to the second bed frame through a folding hinge and setting a locking structure to form a folding structure, the second bed frame can be folded up and down at an angle, and the sofa bed can be converted into a bed and a sofa. The folding mechanism has a simple structure and a reasonable position, making it convenient for users to adjust. Attached Figure Description

[0028] Figure 1 is a schematic diagram of the assembly of the first bed frame in Embodiment 1;

[0029] Figure 2 is a schematic diagram of the bed frame in Example 1;

[0030] Figure 3 is a schematic diagram of the fixing of the first bed frame and bed frame in Embodiment 1;

[0031] Figure 4 is a schematic diagram of the second bed frame and the second support arm before locking in Embodiment 1;

[0032] Figure 5 is a schematic diagram of the second bed frame in the second position in Embodiment 1;

[0033] Figure 6 is a schematic diagram of the second bed frame in the first position in Embodiment 1;

[0034] Figure 7 is a schematic diagram of the connection between the longitudinal bar and the transverse bar in Embodiment 1;

[0035] Figure 8 is an enlarged view of the connection between the second bed frame and the second support arm in Figure 4;

[0036] Figure 9 is an enlarged view of the connection between the second bed frame and the second support arm in Figure 5;

[0037] Figure 10 is a side view of Figure 5;

[0038] Figure 11 is a front view of Figure 5;

[0039] Figure 12 is a top view of Figure 5;

[0040] Figure 13 is a side view of Figure 6;

[0041] Figure 14 is a top view of Figure 6;

[0042] Figure 15 is a schematic diagram of the sofa bed switching to a sofa in Example 1;

[0043] Figure 16 is a schematic diagram of the sofa bed switching to a bed in Example 1;

[0044] Figure 17 is a schematic diagram of the fixing of the first bed frame and bed frame in Embodiment 2;

[0045] Figure 18 is an enlarged view of the connection method between the first bed frame and the bed frame in Embodiment 2;

[0046] Figure 19 is a schematic diagram of the second bed frame and the second support arm before locking in Embodiment 2;

[0047] Figure 20 is a schematic diagram of the second bed frame in the first position in Embodiment 2;

[0048] Figure 21 is an enlarged view of the connection between the second bed frame and the second support arm in Figure 19;

[0049] Figure 22 is a schematic diagram of the locking of the connecting rod and the connecting plate in Embodiment 2;

[0050] Figure 23 is a schematic diagram of the bed board installed in front of the bed frame in Embodiment 2;

[0051] Figure 24 is a schematic diagram of the bed board installed on the bed frame in Example 2;

[0052] Figure 25 is a schematic diagram of the installation of the elastic layer and the bed frame;

[0053] Figure 26 is a schematic diagram of the sofa bed switching to a bed in Example 2;

[0054] Figure 27 is a schematic diagram of the back of the sofa bed when it is switched to a sofa in Example 2.

[0055] Figure 28 is a front view of the sofa bed in Example 2 when it is switched to a sofa. Detailed Implementation

[0056] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0057] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a locking 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 a connection within two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0059] Example 1

[0060] Referring to Figures 1-16, this embodiment provides a foldable armless sofa bed. The backrest of the sofa bed can be laid flat so that the backrest and seat cushion can be joined together to form a flat bed. The backrest can also form an angle of less than 180° with the seat cushion to achieve the function of a regular sofa.

[0061] Therefore, the aforementioned sofa bed includes a structural frame, a padding layer, and an elastic layer; the structural frame is used to support the elastic layer and the padding layer.

[0062] Specifically, the structural frame includes a bed frame and a bed frame; the bed frame includes a left crossbar 3, a right crossbar 4, a longitudinal bar, and first legs; both ends of the left crossbar 3 and the right crossbar 4 are connected to two first legs 5; the longitudinal bar is connected to one end of the first legs 5 of the left crossbar 3 and the right crossbar 4, thereby forming a rectangular frame for placing the bed frame, with the first legs 5 supporting the ground. The elastic padding layer is positioned above the bed frame, and the padding layer is placed above the elastic layer.

[0063] The bed frame consists of a first bed frame 1 and a second bed frame 2 arranged sequentially along the width of the crossbars. The first bed frame 1 is divided into two sub-bed frames, and the second bed frame 2 is also divided into two sub-bed frames. The two sub-bed frames are locked together by bolts and nuts to form either the first bed frame 1 or the second bed frame 2. The first bed frame 1 is locked to the left crossbar 3 and the right crossbar 4 by bolts and nuts, thus being positioned between the left crossbar 3 and the right crossbar 4. The second bed frame 2 is rotatably connected between the left crossbar 3 and the right crossbar 4.

[0064] After the above setup, the first bed frame 1 is fixed to the bed frame, serving as the supporting frame for the seat cushion. The second bed frame 2 can rotate relative to the left crossbar 3 and right crossbar 4 of the bed frame, thereby changing the angle between it and the first bed frame 1, serving as the supporting frame for the backrest.

[0065] By limiting the rotational travel of the second bed frame 2, the second bed frame 2 can have a first position and a second position relative to the first bed frame 1. When the second bed frame 2 is in the first position, the included angle between the first bed frame 1 and the second bed frame 2 is 180°. When the second bed frame 2 is in the second position, the included angle between the first bed frame 1 and the second bed frame 2 is less than 180°.

[0066] In this embodiment, a rotatable connection is achieved between the second bed frame 2 and the left crossbar 3 and right crossbar 4. The left crossbar 3 and right crossbar 4 are rotatably connected to the second bed frame 2 via a folding hinge 8. The folding hinge 8 includes a first arm 81 and a second arm 82 hinged at one end. The other end of the first arm 81 is fixedly connected to the left crossbar 3 or right crossbar 4 approximately perpendicularly, and the other end of the second arm 82 is locked to the second bed frame 2. The height of the first arm is lower than the thickness of the flexible padding layer of the sofa bed, so that the first arm 81 will not protrude from the flexible padding layer after springs are laid on the bed frame. Preferably, it is not higher than the thickness of the spring padding layer.

[0067] Specifically, the second support arm 82 has a first connecting portion at one end facing the second bed frame 2; the second bed frame 2 has a second connecting portion at one side facing the second support arm 82. The second connecting portion includes a sleeve 21 parallel to the direction of the crossbar, and the sleeve 21 passes through first bolt holes 211 on both sides along its thickness direction. The first connecting portion includes a second bolt hole 821 passing through the second support arm 82. It also includes a bolt and a nut. When the second support arm 82 is connected to the second bed frame 2, the first connecting portion of the second support arm 82 passes into the sleeve 21, the bolt passes through the first bolt hole 211 and the second bolt hole 821, and is locked by the nut, thereby locking the other end of the second support arm 82 to the second bed frame 2.

[0068] In this embodiment, the folding hinge includes a locking mechanism for fixing the relative position of the first bed frame 1 and the second bed frame 2. Specifically, the locking mechanism (not shown in the figure) can be a ratchet and pawl, which engages with the ratchet teeth of the ratchet to fix the current position. This structure has been disclosed in several previous applications of the applicant, such as Chinese Patent 2024104039985, which discloses such a ratchet and pawl folding hinge structure. Other structures that can fix the relative position of the first bed frame 1 and the second bed frame 2 can also be used, as long as the purpose of fixing is achieved.

[0069] To increase the stability of the entire structural frame, multiple second supports 6 are provided below the bed frame. The second supports 6 are located in the middle of the length direction of the bed frame, and are distributed in a straight line along the width direction of the bed frame, extending downward to the ground along the height direction to provide a new support point.

[0070] Since the second bed frame 2 is flush with the first bed frame 2 when rotated to the first position, it is necessary to avoid interference from the folding hinge 8 on the crossbar. Therefore, the second bed frame 2 is provided with a clearance recess 22 corresponding to the position of the folding hinge 8. When the second bed frame 2 is in the first position, the folding hinge 8 is placed in the clearance recess 22, thereby avoiding interference between the second bed frame 2 and the folding hinge 8.

[0071] To secure the elastic layer to the bed frame, in this embodiment, multiple transverse fixing rods 9 are arranged along the length of the bed frame, providing support points for the elastic layer. Multiple fixing members 10 are provided on the transverse fixing rods 9 of the bed frame to secure the elastic units of the elastic layer. Multiple fixing fittings are provided at the bottom of the elastic unit; the fixing members 10 and the fixing fittings interlock, thereby installing the elastic unit onto the bed frame and fixing the entire elastic layer to the bed frame. This prevents relative movement of the elastic layer during use.

[0072] Example 2

[0073] Referring to Figures 17-28, the difference between this embodiment and Embodiment 1 is that the second connecting part includes a connecting rod 23 perpendicular to the crossbar direction, and the connecting rod 23 passes through the first bolt holes 231 on both sides along the thickness direction. The first connecting part includes a connecting plate 822 disposed at the end of the second support arm 82, and the second bolt holes 821 pass through the connecting plate 822. It also includes bolts and nuts. When the second support arm 82 is connected to the second bed frame 2, the connecting plate 822 rotates until the first bolt holes 231 and the second bolt holes 821 partially or completely overlap, the bolts pass through the first bolt holes 231 and the second bolt holes 821, and are locked by the nuts, thereby locking the second support arm 82 to the second bed frame 2.

[0074] In addition, to further increase the stability of the elastic layer installation, this embodiment also includes a bed board 11, on which a clearance hole 111 is provided for the fastener 10 to be exposed and a clearance portion 112 is provided for the folding hinge 8 to pass through in the first position. The bed board 11 increases the support area for the elastic layer, making the elastic layer installation more stable. The rest is the same as in Embodiment 1, and will not be described again here.

[0075] The above description is merely a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention by those skilled in the art within the scope of the technology disclosed in the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention. Industrial applicability

[0076] This invention provides a folding mechanism for an armless sofa bed, including a bed frame and a bed frame; the bed frame includes a left crossbar and a right crossbar; the bed frame has a first bed frame and a second bed frame arranged sequentially along the width direction of the crossbars; the first bed frame is locked between the left and right crossbars; the second bed frame is rotatably connected between the left and right crossbars; the left and right crossbars are rotatably connected to the second bed frame via folding hinges; the folding hinge includes a first arm and a second arm hinged at one end; the other end of the first arm is fixedly connected to the left or right crossbar, and the other end of the second arm is locked to the second bed frame; the folding hinge includes a locking mechanism for fixing the relative positions of the first and second bed frames, and has industrial practicality.

Claims

1. A folding mechanism for an armless sofa bed, characterized in that, The bed includes a bed frame and a bed frame; the bed frame includes a left crossbar and a right crossbar; the bed frame has a first bed frame and a second bed frame arranged sequentially along the width direction of the crossbars; the first bed frame is locked between the left and right crossbars; the second bed frame is rotatably connected between the left and right crossbars. The left and right crossbars are rotatably connected to the second bed frame via a folding hinge. The folding hinge includes a first arm and a second arm hinged at one end; the other end of the first arm is fixedly connected vertically to the left or right crossbar, and the other end of the second arm is fixedly connected to the second bed frame; the height of the first arm is lower than the thickness of the elastic layer of the sofa bed. The folding hinge also includes a locking mechanism for fixing the relative positions of the first arm and the second arm.

2. The folding mechanism of the sofa bed according to claim 1, characterized in that, The folding hinge includes a ratchet and a pawl. One end of the first arm is fixedly connected to the ratchet, one end of the second arm is pivotally connected to the ratchet, and the pawl is pivotally connected to the second arm and abuts against the ratchet; or: one end of the first arm is pivotally connected to the ratchet, one end of the second arm is fixedly connected to the ratchet, and the pawl is pivotally connected to the first arm.

3. The folding mechanism of the sofa bed according to claim 2, characterized in that, When the second bed frame is in the first position, a clearance recess is provided corresponding to the position of the folding hinge.

4. The folding mechanism of the sofa bed according to claim 2, characterized in that, The second support arm has a first connecting part at one end facing the second bed frame; the second bed frame has a second connecting part at one side facing the second support arm, and the first connecting part and the second connecting part are locked together.

5. The folding mechanism of the sofa bed according to claim 4, characterized in that, The second connecting part includes a sleeve parallel to the direction of the crossbar, and the sleeve passes through the first bolt holes on both sides along the thickness direction.

6. The folding mechanism of the sofa bed according to claim 5, characterized in that, The first connecting portion includes a second bolt hole that extends along the second arm.

7. The folding mechanism of the sofa bed according to claim 6, characterized in that, It also includes bolts and nuts. When the second support arm is connected to the second bed frame, the first connecting part of the second support arm passes into the sleeve, the bolt passes through the first bolt hole and the second bolt hole, and is locked by the nut.

8. [Revised according to Rule 91, 22.05.2026] The folding mechanism of the sofa bed according to claim 4 is characterized in that, The second connecting part includes a connecting rod perpendicular to the direction of the crossbar, and the connecting rod passes through the first bolt hole on both sides along the thickness direction.

9. [Revised according to Rule 91, 22.05.2026] The folding mechanism of the sofa bed according to claim 8 is characterized in that, The first connecting part includes a connecting plate disposed at the end of the second arm, and a second bolt hole passes through the connecting plate.

10. [Correction 22.05.2026 according to Rule 91] The folding mechanism of the sofa bed according to claim 9 is characterized in that, It also includes bolts and nuts. When the second support arm is connected to the second bed frame, the connecting plate rotates until the first bolt hole and the second bolt hole partially or completely overlap. The bolt passes through the first bolt hole and the second bolt hole and is locked by the nut.

11. [Corrected according to Rule 91, May 22, 2026] A sofa bed, characterized in that, The sofa bed folding mechanism according to any one of claims 1-10 further includes an elastic layer and a cushion layer, wherein the elastic layer is fixed above the bed frame and the cushion layer is placed above the elastic layer.

12. [Correction 22.05.2026 based on Rule 91] The sofa bed according to claim 11 is characterized in that, The bed frame also includes longitudinal bars and first legs, with two first legs connected to the ends of the left and right crossbars respectively; the longitudinal bars are connected to the first legs on the left and right crossbars respectively.

13. [Correction 22.05.2026 according to Rule 91] The sofa bed according to claim 11 is characterized in that, The bed frame is provided with multiple fasteners for fixing the elastic units of the elastic layer.

14. [Correction 22.05.2026 according to Rule 91] The sofa bed according to claim 11 is characterized in that, The first bed frame is divided into two sub-bed frames, and the second bed frame is also divided into two sub-bed frames. The two sub-bed frames are connected to each other to form the first bed frame or the second bed frame.

15. [Correction 22.05.2026 according to Rule 91] The sofa bed according to claim 12 is characterized in that, Multiple second legs are provided below the bed frame.

16. [Correction 22.05.2026 according to Rule 91] The sofa bed according to claim 13 is characterized in that, It also includes a bed board with a clearance hole through which the fastener is exposed and a clearance portion through which the folding hinge passes in the first position.

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