Easy-to-pull sofa bed folding frame

Abstract

The utility model discloses an easy-to-pull sofa bed folding frame, which relates to the technical field of sofa beds, and comprises a fixed arm, a front folding arm and a rear folding arm which are of an L-shaped structure, a rear support and a front support which are used for connecting a head frame and a seat frame, and the same positions of the front folding arm and the rear folding arm are respectively and rotatably connected to a first front support arm and a first middle support arm. The rear end of the front folding arm and the rear end of the rear folding arm are rotationally connected to the front end and the middle of the fixed arm respectively, the front end of the front folding arm is rotationally connected to the second middle supporting arm, the front end of the rear folding arm is rotationally connected to the second rear supporting arm, and the second front supporting arm is rotationally connected with a supporting leg. One end of the tension spring is connected to the L-shaped inflection point of the front folding arm, and the other end of the tension spring is fixed to the rear end of the fixed arm through a limiting cantilever. On one hand, the folding sofa bed is convenient to assemble, on the other hand, the bearing capacity of the sofa bed can be effectively improved, and the sofa bed is easy to push, pull, fold or unfold.

Description

Technical Field

[0001] The utility model belongs to the technical field of sofa beds, and particularly relates to an easy-pull sofa bed folding frame. Background Art

[0002] In order to solve the problem that the existing folding sofa bed is inconvenient to fold, our company designed and proposed a push-pull folding sofa bed folding bracket, which can make the switching between the sofa and the bed more convenient. However, the following deficiencies were found during the production and use process: The folding bracket of the sofa bed adopts a side-mounted method and is directly connected to the seat frame or the head frame. Since the seat frame or the head frame is large in size, directly connecting the folding bracket to the side of the seat frame or the head frame will bring certain difficulties to production and installation, and it is also inconvenient for later maintenance and disassembly. It can be said that "pulling one hair moves the whole body". In addition, in order to make the push-pull folding more labor-saving, we optimized the original structure. Therefore, an easy-pull sofa bed folding frame is proposed. Content of the Utility Model

[0003] The purpose of the utility model is to solve the disadvantages in the prior art that there are great difficulties in the assembly between the seat frame or the head frame and the folding bracket, and the resistance of the push-pull folding is relatively large, and an easy-pull sofa bed folding frame is proposed. On the one hand, the easy-pull sofa bed folding frame facilitates the assembly of the folding sofa bed. On the other hand, it can effectively improve the load-bearing capacity of the sofa bed, and is easy to push-pull fold or unfold.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] Design an easy-pull sofa bed folding frame, which includes a fixed arm, a front folding arm and a rear folding arm of an L-shaped structure. The fixed arm is used for horizontally fixing on the side wall of the sofa. It also includes a rear support and a front support for connecting the head frame and the seat frame. The front end of the rear support is provided with a first front support arm downward, and the middle part and the rear end are provided with an upward first middle support arm and a first rear support arm. The front end and the middle part of the front support are provided with a second front support arm and a second middle support arm downward, and the rear end is provided with an upward second rear support arm. The front folding arm and the rear folding arm are rotatably connected to the first front support arm and the first middle support arm at the same positions respectively. The rear ends of the front folding arm and the rear folding arm are rotatably connected to the front end and the middle part of the fixed arm respectively. The front end of the front folding arm is rotatably connected to the second middle support arm. The front end of the rear folding arm is rotatably connected to the second rear support arm. A leg is rotatably connected to the second front support arm, and the top of the leg is rotatably connected to the front end of the front folding arm through a connecting rod.

[0006] It further includes a tension spring. One end of the tension spring is connected to the L-shaped inflection point of the front folding arm, and the other end is fixed to the rear end of the fixed arm through a limit cantilever. When the seat frame is in the fully folded state or the fully unfolded state, the tension spring is in the maximum stretched state. When the seat frame is at the highest position of push-pull folding, the tension spring is in the minimum stretched state.

[0007] Furthermore, the head frame and the seat frame are provided with mounting holes vertically through them, and are respectively fixed to the rear support and the front support in a bottom-mounted manner.

[0008] Furthermore, the front folding arm and the rear folding arm have the same structure, and the rotation radii around the first front support arm and the first middle support arm are the same.

[0009] Furthermore, a rotating arm is rotatably connected to the first rear support arm, the other end of the rotating arm is rotatably connected to the rear end of the fixed arm, and a folding limit structure is further provided at the rear end of the fixed arm.

[0010] Furthermore, a limit strut is fixedly provided on the front folding arm. After the front folding arm is folded, the limit strut is in a vertical state and is used to support the folded leg.

[0011] The beneficial effects of an easy-pull sofa bed folding frame proposed by the present utility model are as follows:

[0012] (1) By providing the rear support and the front support, the present utility model forms an integral structure with the folding bracket for the rear support and the front support, and the head frame and the seat frame form an independent structure, and are assembled to the rear support and the front support in an up-and-down fixed manner. In this way, on the one hand, it is convenient for the assembly of the folding sofa bed, and on the other hand, by providing the rear support and the front support, the support strength on the sides of the head frame and the seat frame can be enhanced, and the load-bearing capacity of the sofa bed can be effectively improved.

[0013] (2) By providing a tension spring on the front folding arm or the rear folding arm, when the seat frame is pushed, pulled, folded or unfolded, it can play a boosting role, making the folding sofa bed more lightweight and labor-saving during the push-pull folding process, and easier to push, pull, fold or unfold. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0015] Figure 1 is a three-dimensional structural schematic diagram of the present utility model when folded;

[0016] Figure 2 is a side external view structural schematic diagram of the present utility model when folded;

[0017] Figure 3 It is a schematic diagram of the internal view of the side part when the present utility model is in the folded state;

[0018] Figure 4 It is a three-dimensional structure schematic diagram when the present utility model is in the unfolded state;

[0019] Figure 5 It is a schematic diagram of the external view of the side part when the present utility model is in the unfolded state;

[0020] Figure 6 It is a schematic diagram of the internal view of the side part when the present utility model is in the unfolded state;

[0021] The marks in the figure are: 1, fixed arm; 11, front folding arm; 12, rear folding arm; 13, rotating arm; 14, limiting cantilever; 17, limiting strut; 2, rear support; 21, first front support arm; 22, first middle support arm; 23, first rear support arm; 3, front support; 31, second front support arm; 32, second middle support arm; 33, second rear support arm; 4, head frame; 5, seat frame; 6, leg; 61, connecting rod; 7, tension spring. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model; obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, terms such as "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0025] Now, in combination with the accompanying drawings of the specification, the structural features of the present utility model will be described in detail.

[0026] See Figures 1-6 , an easy-to-pull sofa bed folding frame, which includes a fixed arm 1, a front folding arm 11 and a rear folding arm 12 with an L-shaped structure. The fixed arm 1 is used to be horizontally fixed on the side wall of the sofa. It also includes a rear support 2 and a front support 3 for connecting the head frame 4 and the seat frame 5. The head frame 4 and the seat frame 5 are provided with mounting holes in the vertical direction and are respectively fixed on the rear support 2 and the front support 3 in a bottom-mounted manner. The head frame 4 and the seat frame 5 can be separately removed from the rear support 2 and the front support 3. During assembly, the rear support 2 and the front support 3 are assembled with the front folding arm 11 and the rear folding arm 12 into an integral structure, and then connected to the head frame 4 and the seat frame 5 through the rear support 2 and the front support 3, thus forming a modular structure. The head frame 4 and the seat frame 5 form independent structures and can be separately disassembled. With this independently designed structure, it is more convenient and fast in assembly and maintenance. At the same time, the setting of the rear support 2 and the front support 3 can increase the support strength on both sides of the head frame 4 and the seat frame 5, making the sofa bed more durable.

[0027] In order to realize the connection between the rear support 2 and the front support 3 and the front folding arm 11 and the rear folding arm 12, a first front support arm 21 is provided downward at the front end of the rear support 2, and upward first middle support arms 22 and first rear support arms 23 are provided at the middle and rear ends. Second front support arms 31 and second middle support arms 32 are provided downward at the front end and the middle of the front support 3, and a second rear support arm 33 is provided upward at the rear end. The front folding arm 11 and the rear folding arm 12 are rotatably connected to the first front support arm 21 and the first middle support arm 22 at the same positions respectively. The rear ends of the front folding arm 11 and the rear folding arm 12 are rotatably connected to the front end and the middle of the fixed arm 1 respectively. The front end of the front folding arm 11 is rotatably connected to the second middle support arm 32, and the front end of the rear folding arm 12 is rotatably connected to the second rear support arm 33. Among them, the front folding arm 11 and the rear folding arm 12 have the same structure and the same rotation radius around the first front support arm 21 and the first middle support arm 22, so that the front folding arm 11 and the rear folding arm 12 rotate synchronously to realize the push-pull folding or unfolding of the head frame 4 and the seat frame 5. A leg 6 is rotatably connected to the second front support arm 31, and the top of the leg 6 is rotatably connected to the front end of the front folding arm 11 through a connecting rod 61. During the folding process of the front folding arm 11, the leg 6 is driven to fold or unfold synchronously through the connecting rod 61. In order to make the seat frame 5 more stable during the folding process, a rotating arm 13 is rotatably connected to the first rear support arm 23, and the other end of the rotating arm 13 is rotatably connected to the rear end of the fixed arm 1. The rotating arm 13 rotates synchronously with the front folding arm 11 and the rear folding arm 12, playing a role in stabilizing the rear of the seat frame 5.

[0028] It further includes a tension spring 7. One end of the tension spring 7 is connected to the L-shaped inflection point of the front folding arm 11, and the other end is fixed to the rear end of the fixed arm 1 through a limiting cantilever 14. When the seat frame 5 is in the fully folded state or the fully unfolded state, the tension spring 7 is in the maximum stretched state. When the seat frame 5 is at the highest position of the push-pull folding, the tension spring 7 is in the minimum stretched state. When the seat frame 5 is switched from the fully folded state or the fully unfolded state, the tension spring 7 provides a pulling force to the seat frame 5 to assist in the push-pull folding for better folding or unfolding.

[0029] After folding, a limiting support rod 17 is fixedly provided on the front folding arm 11. After the front folding arm 11 is folded, the limiting support rod 17 is in a vertical state to support the folded leg 6.

[0030] The easy-to-pull sofa bed folding frame of the present utility model is convenient for assembly and maintenance, and is easy to fold or unfold. Specifically: by setting the rear support 2 and the front support 3, the rear support 2 and the front support 3 form an integral structure with the front folding arm 11 and the rear folding arm 12. The head frame 4 and the seat frame 5 form an independent structure and are assembled on the rear support 2 and the front support 3 in a vertically fixed manner. In this way, on the one hand, it is convenient for the assembly of the folding sofa bed, and on the other hand, by setting the rear support 2 and the front support 3, the support strength on the sides of the head frame 4 and the seat frame 5 can be enhanced, and the load-bearing capacity of the sofa bed can be effectively improved. By setting a tension spring 7 on the front folding arm 11 or the rear folding arm 12, it can play a role in assisting during folding or unfolding, making the folding sofa bed more lightweight and labor-saving during the push-pull folding process, and easier to push-pull fold or unfold.

[0031] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A folding frame for a pull-out sofa bed, comprising a fixed arm (1) and a front folding arm (11) and a rear folding arm (12) of an L-shaped structure, wherein the fixed arm (1) is used for horizontally fixing on a side wall of a sofa, and is characterized in that: It also includes a rear support (2) and a front support (3) for connecting the head frame (4) and the seat frame (5); The front end of the rear support (2) is provided with a first front support arm (21) pointing downwards, and the middle and rear ends are provided with a first middle support arm (22) pointing upwards and a first rear support arm (23); The front end and middle part of the front support (3) are downwardly provided with a second front support arm (31) and a second middle support arm (32), and the rear end is upwardly provided with a second rear support arm (33); The same positions of the front folding arm (11) and the rear folding arm (12) are rotatably connected to the first front support arm (21) and the first middle support arm (22), respectively; the rear ends of the front folding arm (11) and the rear folding arm (12) are rotatably connected to the front end and the middle part of the fixed arm (1), respectively; the front end of the front folding arm (11) is rotatably connected to the second middle support arm (32), and the front end of the rear folding arm (12) is rotatably connected to the second rear support arm (33); The second front support arm (31) is rotatably connected to a support leg (6), and the top of the support leg (6) is rotatably connected to the front end of the front folding arm (11) via a connecting rod (61); It also includes a tension spring (7), one end of which is connected to the L-shaped inflection point of the front folding arm (11), and the other end of which is fixed to the rear end of the fixed arm (1) through a limiting cantilever (14). When the seat frame (5) is in a fully folded state or a fully unfolded state, the tension spring (7) is in a maximum tension state, and when the seat frame (5) is in the highest push-pull folding position, the tension spring (7) is in a minimum tension state.

2. The folding frame of the pull-out sofa bed according to claim 1, characterized in that: The head frame (4) and the seat frame (5) are provided with mounting holes extending through them in the vertical direction, and are respectively fixed on the rear support (2) and the front support (3) in a bottom mounting manner.

3. The folding frame of the pull-out sofa bed according to claim 1, characterized in that: The front folding arm (11) and the rear folding arm (12) have the same structure, and have the same rotation radius around the first front support arm (21) and the first middle support arm (22).

4. The folding frame of the pull-out sofa bed according to claim 1, characterized in that: The first rear support arm (23) is rotatably connected to a rotating arm (13), the other end of the rotating arm (13) is rotatably connected to the rear end of the fixed arm (1), and the rear end of the fixed arm (1) is also provided with a folding limit structure.

5. The folding frame of the pull-out sofa bed according to claim 1, characterized in that: A limiting support rod (17) is fixedly provided on the front folding arm (11); after the front folding arm (11) is folded, the limiting support rod (17) is in a vertical state, and is used to support the folded supporting leg (6).

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