Backrest folding and unfolding mechanism
By setting up a bracket assembly between the backrest body and the backrest frame of the sofa bed, the self-locking expansion and folding of the backrest is solved, and the problem of the existing sofa bed backrest needs to reserve the rear space, improving the convenience of use and space utilization efficiency.
Patent Information
- Application Number
- CN202421696950.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-17
AI Technical Summary
The backrest of the existing sofa bed needs to be reserved on the back, resulting in limited indoor placement and use space. It is very inconvenient to move the sofa frequently during use.
A backrest expansion mechanism is designed. By providing a bracket assembly between the backrest body and the backrest frame, including a base, a connecting base, an upper connecting arm and a lower connecting arm, the rotating connection and limiting surface of these components realize self-locking expansion and folding of the backrest, avoiding the need to reserve space on the backrest.
The stable structure and convenient use of the backrest are achieved, without the need to reserve space on the backrest of the sofa backrest. The overall use is more convenient and adapts to the placement needs of limited indoor space.
Smart Images
Figure CN222815547U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of furniture, in particular to a backrest folding and unfolding mechanism. Background Art
[0002] In the field of sofa technology, in order to further improve and expand the performance of sofas, some sofas can be expanded into sofa beds. Therefore, when designing, the backrest of the sofa is usually designed to be a flippable structure. When used as a sofa, the backrest is erected, and when used as a sofa bed, the backrest is flipped backwards to a horizontal state as a part of the sofa bed. The backrest of existing sofa beds is usually flipped backwards, so it is necessary to reserve enough space behind the backrest of the sofa, which seriously limits the placement and use space of the sofa bed in the room. Usually, the indoor space is limited. If the backrest of the sofa bed is placed against the wall, the sofa needs to be moved every time the backrest is flipped, which is very inconvenient to use. Utility Model Content
[0003] In order to solve the above problems existing in the prior art, the utility model provides a backrest folding and extending mechanism which has a stable structure, is easy to use, and does not require a reserved space on the back side of the backrest.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A backrest folding and extending mechanism comprises a bracket assembly arranged between a backrest body and a backrest frame; the bracket assembly comprises a base fixedly mounted on the backrest frame, a first connecting seat fixedly mounted on the backrest body, an upper connecting arm, and a lower connecting arm, one end of the upper connecting arm is rotatably connected to the upper end of the first connecting seat, the other end of the upper connecting arm is rotatably connected to the upper end of the base, one end of the lower connecting arm is rotatably connected to the lower end of the first connecting seat, and the other end of the lower connecting arm is rotatably connected to the lower end of the base; when the backrest body is rotated to a backrest state, the lower connecting arm abuts against the upper connecting arm for self-locking; when the backrest body is rotated to a horizontal state, the upper connecting arm abuts against the lower connecting arm for self-locking.
[0006] By adopting the above technical solution: when it needs to be used as a bed, the backrest body is unfolded forward to a horizontal state and self-locked, so there is no need to reserve space in the rear area of the sofa backrest, and the overall use is more convenient; when it needs to be used as a sofa, the backrest body is rotated to the backrest state and self-locked, and the overall structure is stable and easy to use.
[0007] Preferably, the bracket assembly is configured as two groups, and the two groups of bracket assemblies are arranged on the left and right sides of the backrest body. With the two groups of bracket assemblies, the support positioning is more stable.
[0008] Preferably, a first limiting surface is provided on the rear side of the upper end of the lower connecting arm, and when the backrest body rotates to the backrest state, the first limiting surface abuts against the lower side surface of the upper connecting arm.
[0009] Preferably, a second limiting surface is provided on the rear side of the lower connecting arm, and when the backrest body is rotated to a horizontal state, the front side of the upper end of the upper connecting arm abuts against the second limiting surface for limiting position.
[0010] Preferably, a third limiting surface is provided on the rear side of the lower end of the upper connecting arm, and when the backrest body is rotated to a horizontal state, the third limiting surface on the upper connecting arm abuts against the rear side surface of the backrest body for limiting position.
[0011] Preferably, a second connecting seat is provided at the lower end of the backrest body, a supporting foot is rotatably provided on the second connecting seat, and a transmission member is provided between the supporting foot and the bracket assembly; when the backrest body is rotated to a horizontal state, the transmission member drives the supporting foot to rotate to be perpendicular to the horizontal plane; when the backrest body is rotated to a backrest state, the supporting foot rotates and retracts to the area between the backrest body and the backrest frame. When the backrest body is unfolded to a horizontal state, the supporting foot is automatically opened to a vertical state by the transmission member, which is more convenient to operate.
[0012] Preferably, the transmission member is configured as a transmission arm, one end of the transmission arm is rotatably connected to the upper end of the supporting foot, and the other end of the transmission arm is rotatably connected to the upper end of the lower connecting arm.
[0013] Preferably, the supporting legs are configured into two groups, and a connecting rod is provided between the two groups of supporting legs.
[0014] Preferably, when the backrest body is in the backrest state, a preset obtuse angle α is formed between the surface where the backrest body is located and the horizontal plane, wherein 100°≤α≤110°.
[0015] Preferably, a stopper is fixedly provided on the backrest frame at the upper side of the bracket assembly, and when the backrest body is in the backrest state, the stopper abuts against the rear side of the backrest body. When the backrest body is used as a sofa backrest, the back side of the backrest body is supported by the stopper, thereby increasing the pressure bearing capacity of the backrest body.
[0016] Therefore, the utility model has the beneficial effects of stable structure, convenient use, and no need to reserve space on the back side of the backrest. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the backrest body in the sofa backrest state.
[0018] Figure 2 It is a connection diagram of the backrest body, bracket assembly and backrest frame.
[0019] Figure 3 A schematic diagram of the structure of the bracket assembly.
[0020] Figure 4 This is a schematic diagram of the intermediate process state of the backrest body being unfolded.
[0021] Figure 5 This is a schematic diagram of the backrest body being fully unfolded to a horizontal state.
[0022] Figure 6 for Figure 5 Another perspective of the picture.
[0023] Figure 7 It is a schematic diagram of the state of the backrest body in the sofa bed. DETAILED DESCRIPTION
[0024] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the scope of protection of the present invention.
[0025] It should be understood that, in this document, the expressions "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance, nor should they be understood as implicitly indicating the number of technical features indicated. Features defined as "first" or "second" may explicitly or implicitly indicate that at least one of the features is included.
[0026] like Figure 1-Figure 6 A backrest folding and extending mechanism shown in the figure includes a bracket assembly 20 arranged between the backrest body 10 and the backrest frame 1; the bracket assembly 20 includes a base 21 fixed on the backrest frame 1, a first connecting seat 22 fixed on the backrest body 10, an upper connecting arm 23, and a lower connecting arm 24, one end of the upper connecting arm 23 is rotatably connected to the upper end of the first connecting seat 22, the other end of the upper connecting arm 23 is rotatably connected to the upper end of the base 21, one end of the lower connecting arm 24 is rotatably connected to the lower end of the first connecting seat 22, and the other end of the lower connecting arm 24 is rotatably connected to the lower end of the base 21; when the backrest body 10 is rotated to the backrest state, the lower connecting arm 24 abuts against the upper connecting arm 23 for self-locking; when the backrest body 10 is rotated to the horizontal state, the upper connecting arm 23 abuts against the lower connecting arm 24 for self-locking.
[0027] In some embodiments, the bracket assembly 20 is configured into two groups, and the two groups of bracket assemblies 20 are disposed on the left and right sides of the backrest body 10 .
[0028] A first limiting surface 240 is provided at the rear side of the upper end of the lower connecting arm 24. When the backrest body 10 rotates to the backrest state, the first limiting surface 240 abuts against the lower side surface of the upper connecting arm 23. A second limiting surface 241 is provided at the rear side of the lower connecting arm 24. When the backrest body 10 rotates to the horizontal state, the upper front side of the upper connecting arm 23 abuts against the second limiting surface 241 for limiting position. A third limiting surface 230 is provided at the rear side of the lower end of the upper connecting arm 23. When the backrest body 10 rotates to the horizontal state, the third limiting surface 230 on the upper connecting arm 23 abuts against the rear side surface of the backrest body 10 for limiting position. A stopper 2 is fixedly provided on the backrest frame 1 at the upper side of the bracket assembly 20. When the backrest body 10 is in the backrest state, the stopper 2 abuts against the rear side surface of the backrest body 10.
[0029] A second connecting seat 30 is provided at the lower end of the backrest body 10, and a supporting foot 31 is rotatably provided on the second connecting seat 30, and a transmission member 32 is provided between the supporting foot 31 and the bracket assembly 20; when the backrest body 10 rotates to a horizontal state, the transmission member 32 drives the supporting foot 31 to rotate to be perpendicular to the horizontal plane; when the backrest body 10 rotates to the backrest state, the supporting foot 31 rotates and retracts to the area between the backrest body 10 and the backrest frame 1.
[0030] In this embodiment, the transmission member 32 is configured as a transmission arm 320, one end of the transmission arm 320 is rotatably connected to the upper end of the support leg 31, and the other end of the transmission arm 320 is rotatably connected to the upper end of the lower connecting arm 24. The support legs 31 are configured in two groups, and a connecting rod 310 is provided between the two groups of support legs 31. Figure 2 As shown, when the backrest body 10 is in the backrest state, a preset obtuse angle α is formed between the surface where the backrest body 10 is located and the horizontal plane, 100°≤α≤110°. In some embodiments, the obtuse angle α is set to 105°.
[0031] In conjunction with the accompanying drawings, the principle of the utility model is as follows: Figure 2 As shown, the backrest body 10 is in a folded state, the first limiting surface 240 and the upper connecting arm 23 are self-locking and limiting, and the stopper 2 limits the back support of the backrest body. At this time, the backrest body is used as a sofa backrest; when the backrest body needs to be unfolded for use as a bed body, as shown in FIG. Figure 4 and Figure 5 As shown, pull the backrest body 10 forward, the bracket assembly Figure 4 , Figure 5 The supporting legs 31 are rotated to a vertical position with respect to the horizontal plane under the action of the transmission member 32. Figure 7 shown.
[0032] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by up, down, left, right, inner end, outer end, one end, the other end, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of more clearly describing the technical solution of the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific orientation, and cannot be understood as a limitation of the present invention.
[0033] Although specific embodiments of the present invention are described in detail herein, they are provided for the purpose of explanation only and should not be considered to limit the scope of the present invention. Various substitutions, changes and modifications may be conceived without departing from the spirit and scope of the present invention.
Claims
1. A backrest folding and unfolding mechanism, characterized in that: It comprises a bracket assembly (20) arranged between a backrest body (10) and a backrest frame (1); The bracket assembly (20) comprises a base (21) fixedly mounted on the backrest frame (1), a first connecting seat (22) fixedly mounted on the backrest body (10), an upper connecting arm (23), and a lower connecting arm (24); one end of the upper connecting arm (23) is rotatably connected to the upper end of the first connecting seat (22), the other end of the upper connecting arm (23) is rotatably connected to the upper end of the base (21), one end of the lower connecting arm (24) is rotatably connected to the lower end of the first connecting seat (22), and the other end of the lower connecting arm (24) is rotatably connected to the lower end of the base (21); When the backrest body (10) is rotated to a backrest state, the lower connecting arm (24) and the upper connecting arm (23) abut against each other and are self-locked; when the backrest body (10) is rotated to a horizontal state, the upper connecting arm (23) and the lower connecting arm (24) abut against each other and are self-locked.
2. The backrest folding and unfolding mechanism according to claim 1, characterized in that: The bracket components (20) are configured into two groups, and the two groups of bracket components (20) are arranged on the left and right sides of the backrest body (10).
3. The backrest folding and unfolding mechanism according to claim 1, characterized in that: A first limiting surface (240) is provided on the rear side of the upper end of the lower connecting arm (24); when the backrest body (10) rotates to a backrest state, the first limiting surface (240) abuts against the lower side surface of the upper connecting arm (23).
4. The backrest folding and unfolding mechanism according to claim 1 or 3, characterized in that: A second limiting surface (241) is provided on the rear side of the lower connecting arm (24), and when the backrest body (10) rotates to a horizontal state, the front side of the upper end of the upper connecting arm (23) abuts against the second limiting surface (241) for limiting position.
5. The backrest folding and unfolding mechanism according to claim 4, characterized in that: A third limiting surface (230) is provided on the rear side of the lower end of the upper connecting arm (23); when the backrest body (10) rotates to a horizontal state, the third limiting surface (230) on the upper connecting arm (23) abuts against the rear side surface of the backrest body (10) to limit the position.
6. The backrest folding and unfolding mechanism according to claim 1 or 2, characterized in that: A second connecting seat (30) is provided at the lower end of the backrest body (10); a supporting foot (31) is rotatably provided on the second connecting seat (30); and a transmission member (32) is provided between the supporting foot (31) and the bracket assembly (20); When the backrest body (10) rotates to a horizontal state, the transmission member (32) drives the support legs (31) to rotate to be perpendicular to the horizontal plane; when the backrest body (10) rotates to a backrest state, the support legs (31) rotate and retract to an area between the backrest body (10) and the backrest frame (1).
7. The backrest folding and unfolding mechanism according to claim 6, characterized in that: The transmission member (32) is configured as a transmission arm (320), one end of the transmission arm (320) is rotatably connected to the upper end of the support leg (31), and the other end of the transmission arm (320) is rotatably connected to the upper end of the lower connecting arm (24).
8. The backrest folding and unfolding mechanism according to claim 6, characterized in that: The supporting legs (31) are configured into two groups, and a connecting rod (310) is provided between the two groups of supporting legs (31).
9. The backrest folding and unfolding mechanism according to claim 1, characterized in that: When the backrest body (10) is in a backrest state, a preset obtuse angle α is formed between the surface where the backrest body (10) is located and a horizontal plane, and 100°≤α≤110°.
10. The backrest folding and unfolding mechanism according to claim 1, characterized in that: A stopper (2) is fixedly provided on the backrest frame (1) at an upper side of the bracket assembly (20); when the backrest body (10) is in a backrest state, the stopper (2) abuts against a rear side surface of the backrest body (10).