Folding hinge for sofa and bed conversion

Abstract

The utility model relates to the field of sofa bed, concretely relates to sofa and bed interchanging folding hinge, including mounting seat, the mounting seat front side end face is rotationally installed with small bend connecting rod through pin shaft, small bend connecting rod front side end face is rotationally installed with rear foot code through pin shaft, the middle part of mounting seat front side end face is rotationally installed with big bend arm through pin shaft, and the right side between big bend arm and rear angle code is rotationally connected through pin shaft, the bed structure compact conversion into sofa of hinge composition in the utility model occupies small floor space, when conversion into bed, do not influence the comfort, and when the bed and sofa change, nimble, one person can easily operate, and the floor area is small, make space utilization more higher, and the practicality is stronger.

Description

Technical Field

[0001] This utility model relates to the field of sofa beds, specifically to an interchangeable folding hinge for sofas and beds. Background Technology

[0002] Current sofa beds on the market often suffer from limited functionality, large footprint, and difficulty in operation, making them challenging for one person to manage. This product is an improvement upon our previous three-fold sofa hinge designs. While offering greater surface area and comfort, it reduces the distance between the armrests and seat cushions, resulting in a more compact structure. When unfolded, all three seat cushions lie on the same plane, providing superior comfort in both sofa and bed configurations. Furthermore, it unfolds flexibly and is easy to operate.

[0003] To meet market demands and address the issues of bulky armrests and large gaps between seats in other hinge designs, this hinge was designed. It features fewer parts and a compact structure, with self-limiting mechanisms during opening and folding, resulting in greater product stability. When assembled into a bed, this hinge reduces the floor space while maintaining the same bed area, and provides better sleeping comfort. It also allows for easy and flexible interchangeability between beds and sofas. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides an interchangeable folding hinge for sofas and beds, including a mounting base. A small curved connecting rod is rotatably mounted on the front end face of the mounting base via a pin. A rear corner bracket is rotatably mounted on the front end face of the small curved connecting rod via a pin. A large curved arm is rotatably mounted on the middle of the front end face of the mounting base via a pin. The right side of the large curved arm is rotatably connected to the rear corner bracket via a pin.

[0005] Preferably, a center angle bracket is rotatably mounted on the left side of the large curved arm via a pin, and an F-arm is rotatably mounted on the front end face of the mounting base via a pin. The F-arm and the large curved arm are rotatably connected via a pin, and a locking plate is installed on the outer wall of the F-arm.

[0006] Preferably, a right-angle bracket is rotatably mounted on the front end face of the F-arm via a pin, and the right-angle bracket and the middle angle bracket are connected by a large curved arm.

[0007] Preferably, the F-arm and the mounting base are rotatably connected by a spring pin.

[0008] Preferably, the small curved connecting rod and the mounting base are rotatably connected by a straight connecting rod pin.

[0009] The technical effects and advantages of this utility model are as follows: The bed structure composed of hinges in this utility model is compact and occupies little space when transformed into a sofa; it does not affect comfort when transformed into a bed, and the transformation between bed and sofa is light and flexible, which can be easily operated by one person, and the small footprint makes the space utilization more efficient and more practical. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the first structure of the bed state with interchangeable folding hinges for sofas and beds provided in the embodiments of this application; Figure 2 This is a schematic diagram of the second structure of the bed state with interchangeable folding hinges for sofas and beds provided in the embodiments of this application; Figure 3 This is a schematic diagram of the first structure of a sofa with interchangeable folding hinges for sofa and bed, provided in an embodiment of this application. Figure 4 This is a second structural diagram of a sofa with interchangeable folding hinges for sofas and beds, provided in an embodiment of this application. In the diagram: 1. Mounting base; 2. F-arm; 3. Large curved arm; 4. Front corner bracket; 5. Middle corner bracket; 6. Rear corner bracket; 7. Small curved connecting rod; 8. Straight connecting rod; 9. Spring; 10. Locking plate; 11. Limiting point three; 12. Limiting point four; 13. Limiting point five; 14. Limiting pin two. Detailed Implementation

[0011] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0012] Please see Figures 1-4 In this embodiment, an interchangeable folding hinge for sofas and beds is provided, including a mounting base 1. A small curved connecting rod 7 is rotatably mounted on the front end face of the mounting base 1 via a pin. A rear corner bracket is rotatably mounted on the front end face of the small curved connecting rod 7 via a pin. A large curved arm 3 is rotatably mounted on the middle of the front end face of the mounting base 1 via a pin. The right side of the large curved arm 3 is rotatably connected to the rear corner bracket 6 via a pin.

[0013] The large curved arm 3 has a center angle bracket 5 rotatably mounted on its left side via a pin. The front end face of the mounting base 1 has an F-arm 2 rotatably mounted on it via a pin. The F-arm 2 and the large curved arm 3 are rotatably connected via a pin. The front end face of the F-arm 2 has a right angle bracket rotatably mounted on it via a pin. The right angle bracket and the center angle bracket 5 are connected via the large curved arm 3. The F-arm 2 and the mounting base 1 are rotatably connected via a spring 9 via a pin. A locking plate 10 is installed on the outer wall of the F-arm 2. The small curved connecting rod 7 and the mounting base 1 are rotatably connected via a straight connecting rod 8 via a pin. During operation, springs or motors are used to apply auxiliary force, making it flexible and easy to operate.

[0014] This hinge mainly consists of a mounting base 1 and multiple four-bar linkages, including a rear corner bracket 6, a middle corner bracket 5, a front corner bracket 4, an F-arm 2, a large curved arm 3, a small curved connecting rod 7, and a straight connecting rod 8. The mounting base 1, F-arm 2, large curved arm 3, front corner bracket 4, and middle corner bracket 5 form a double parallel four-bar linkage. The rear corner bracket 6, connected by the large curved arm 3 and the small curved connecting rod 7, also forms a parallel four-bar linkage. When a force F is applied to the front corner bracket 4, the F-arm 2 and the large curved arm 3 move together, causing the front and middle corner brackets 5 to move. The rear corner bracket 6, driven by the large curved arm 3, rotates simultaneously with the small curved connecting rod 7. Through the contact of these components, a limiting position is formed, allowing the bed and sofa to be switched between modes.

[0015] This hinge uses a multi-position limiting and locking structure, ensuring the sofa bed remains highly stable in both bed and sofa positions. The locking structure further enhances its safety. In actual operation, when the bed is transformed into a sofa, moving the locking plate disengages it from the limit pin 1, allowing the F-arm and front corner bracket to resume rotation. (See attached...) Figure 1 As shown, pushing the bed drawer moves the front corner bracket backward, causing the F-arm and large curved arm to rotate around the axis on the mounting base. This causes the F-arm and large curved arm to move the middle corner bracket backward, while the large curved arm pushes the rear corner bracket down to form a sofa. Figure 3 In this state, limit pin 214 and arm F are in contact, and limit point 311 is in the limit position. Figure 4 Simultaneously, the F-arm and the large curved arm contact, with limit points 4.12 and 5.13 providing limit. When the bed drawer is pulled in the opposite direction, the front corner bracket moves forward, causing the F-arm and the large curved arm to rotate around the axis on the mounting plate, which in turn causes the middle corner bracket to move forward. At the same time, the large curved arm causes the rear corner bracket to move upward, opening the hinge and restoring the bed to its original position. Figure 1 In this state, limit pin 1 is in contact with arm F, and limit point 1 is in position; arm F is in contact with the large curved arm, and limit point 2 is in position. Moving the locking plate makes the locking plate contact with limit pin 1, locking the rotating bed into a safe state.

[0016] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A sofa and bed interchangeable folding hinge, including a mounting base (1), characterized in that, The front end face of the mounting base (1) is rotatably mounted with a small curved connecting rod (7) via a pin. The front end face of the small curved connecting rod (7) is rotatably mounted with a rear foot bracket via a pin. The middle part of the front end face of the mounting base (1) is rotatably mounted with a large curved arm (3) via a pin. The right side of the large curved arm (3) is rotatably connected to the rear corner bracket (6) via a pin. The left side of the large curved arm (3) is rotatably mounted with a middle corner bracket (5) via a pin. The front end face of the mounting base (1) is rotatably mounted with an F arm (2) via a pin. The F arm (2) is rotatably connected to the large curved arm (3) via a pin. The front end face of the F arm (2) is rotatably mounted with a right angle bracket via a pin. The right angle bracket is connected to the middle corner bracket (5) via the large curved arm (3). The F arm (2) is rotatably connected to the mounting base (1) via a spring (9) pin. The small curved connecting rod (7) is rotatably connected to the mounting base (1) via a straight connecting rod (8) pin.

2. The sofa and bed interchangeable folding hinge according to claim 1, characterized in that, A locking plate (10) is installed on the outer wall of the F arm (2).

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