Novel silent sofa bed frame

Abstract

The utility model provides a novel mute type sofa bed frame, which comprises a fixed frame and a movable frame movably installed on the fixed frame, the fixed frame is provided with a guide frame, the movable frame is provided with an installation frame, the installation frame is provided with a moving assembly matched with the guide frame, the moving assembly comprises a screw rod, a fixed frame and a movable frame, the special screw rod is provided with an external thread connecting part, an optical axis part and a limiting part, the outer diameter sizes of the external thread connecting part, the optical axis part and the limiting part are sequentially increased, the special screw rod structure is designed, and a rotatable nylon sleeve and a roller are arranged on the special screw rod structure, so that mutual contact between metal pieces can be effectively prevented; the mute effect of the sofa bed in the use process is obviously improved; meanwhile, the auxiliary holes are formed in the side face of the guide frame, so that the moving assembly can be rapidly disassembled, assembled and maintained, the problems that an existing structure is difficult to maintain and high in maintenance cost are solved, and the maintainability and use convenience of the structure are improved.

Description

Technical Field

[0001] This utility model belongs to the field of furniture technology and relates to a novel silent sofa bed frame. Background Technology

[0002] A sofa bed is a multifunctional piece of furniture that combines the functions of a sofa and a bed. Its structure allows for easy switching between sitting and lying down, making it widely used in homes, offices, and small apartments. As its core load-bearing structure, the sofa bed frame not only needs sufficient load-bearing capacity but also requires flexible expansion and contraction to meet users' dual needs for comfort and efficient space utilization.

[0003] For example, Chinese utility model patent application number 202123114447.6 discloses an electric push-pull bed, which has the advantages of small size and reduced packaging and transportation costs. However, the sofa bed frames in the aforementioned patent and existing technologies usually achieve the conversion of the usage state through a slide rail assembly. This slide rail assembly is a pull-out structure, mainly relying on the rolling contact between the metal guide rail and the ball bearings to complete the operation. However, due to factors such as the manufacturing precision of the slide rail, the lubrication of the ball bearings, and the assembly precision, "metal friction noise" or "vibration resonance noise" is easily generated during operation, especially after long-term use or after dust enters the track, which seriously affects the user experience. In addition, some sofa bed structures adopt a fully enclosed or non-modular slide rail design. Once the internal slide rail assembly is worn or damaged, it is difficult to disassemble and repair it individually. It is necessary to replace the entire slide rail or related structural components, which increases maintenance costs and operational complexity. Furthermore, due to the complex design of the slide rail structure and the lack of reasonable assembly channels, the disassembly and assembly efficiency during installation, maintenance, or transportation is low, the labor cost is high, and problems such as misassembly or component damage may occur. Utility Model Content

[0004] The purpose of this utility model is to provide a new type of silent sofa bed frame to solve the problems mentioned in the background art, such as high operating noise, enclosed structure that is not easy to disassemble and install, and difficulty in maintenance and replacement during the use of existing slide rail assemblies.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A novel silent sofa bed frame includes a fixed frame and a movable frame movably mounted on the fixed frame. The fixed frame has a guide frame, and the movable frame has a mounting frame. The mounting frame has a moving component that matches the guide frame. The moving component includes:

[0007] The screw has an external threaded connection part, a smooth shaft part and a limiting part. The outer diameter of the external threaded connection part, the smooth shaft part and the limiting part increases sequentially. The stepped surface at the end of the smooth shaft part abuts against the side wall of the mounting bracket.

[0008] A nylon sleeve is fitted onto the optical axis of the screw and is rotatable relative to the screw. The nylon sleeve contacts and is rolled into contact with the guide frame.

[0009] A roller is fitted onto the optical shaft portion of the screw at the end furthest from the external threaded connection portion, and is capable of rotating relative to the screw. The roller contacts and rolls with the guide frame.

[0010] Preferably, the guide frame is located on both sides of the fixed frame. The guide frame is a square tube structure. A guide groove is provided on the inner side of the guide frame. The guide groove extends along the length of the guide frame and is consistent with the movement trajectory of the movable frame. The nylon sleeve passes through the guide groove.

[0011] Preferably, the roller is located inside the guide frame and contacts the bottom wall of the guide frame's square tube structure.

[0012] Preferably, the outer side of the guide frame is provided with a process hole, the diameter of which is larger than the outer diameter of the roller.

[0013] Preferably, the cross-sectional outline of the nylon sleeve is T-shaped or straight-through.

[0014] Preferably, the limiting part and the optical axis part are integrally formed or connected by screws.

[0015] Preferably, the external threaded connection of the screw passes through the mounting hole opened on the surface of the mounting bracket, and the screw is fixed to the mounting bracket by a nut.

[0016] Preferably, a first connecting rod is hinged to the middle of the fixed frame, a second connecting rod is hinged to the end of the first connecting rod, a third connecting rod is hinged to the end of the second connecting rod, and the third connecting rod is hinged to the upright plate installed at the end of the movable frame.

[0017] After the movable frame is extended to its limit position, the first link is in a vertical state, and the second and third links are in a horizontal state. When the second and third links are in a horizontal state, the end of the second link extends toward the third link to form a positioning end. The positioning end contacts the upper plane of the third link to prevent the second link from continuing to rotate relative to the third link in the horizontal state.

[0018] Preferably, a movable wheel is installed on the lower outer side of the movable frame, and an electric linear guide driver is installed on the movable frame. The slider of the electric linear guide driver is connected to the fixed frame, so that the movable frame can move horizontally relative to the fixed frame when started.

[0019] Preferably, the moving component is provided in at least two sets, and the screw has a through central hole in the middle, the cross-sectional shape of which is a regular polygon.

[0020] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0021] This invention, through the design of a special screw structure with rotatable nylon sleeves and rollers, effectively prevents contact between metal parts, significantly improving the quietness of the sofa bed during use. Simultaneously, by providing process holes on the side of the guide frame, it facilitates quick disassembly and maintenance of the moving components, solving the problems of difficult repair and high maintenance costs in existing structures, and improving the maintainability and ease of use of the structure. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of the present utility model;

[0024] Figure 2 A perspective view of the installation of the mobile component of this utility model;

[0025] Figure 3 This utility model Figure 2 Exploded view;

[0026] Figure 4 This utility model Figure 2 A sectional view;

[0027] Figure 5 This is a cross-sectional view of the guide frame of this utility model;

[0028] Figure 6 This is a perspective view of the guide frame of this utility model;

[0029] Figure 7 This is a perspective view of the screw of this utility model;

[0030] Figure 8 This is a partial enlarged view of the present invention.

[0031] Figure 9 This is a cross-sectional view of the mobile component installation structure according to another embodiment of the present invention.

[0032] in:

[0033] 1. Fixed frame; 2. Movable frame; 3. Mounting frame; 301. Mounting hole; 4. Electric linear guide driver; 5. Vertical plate; 6. First connecting rod; 7. Second connecting rod; 701. Positioning end; 8. Third connecting rod; 9. Guide frame; 901. Guide groove; 902. Bottom wall; 903. Process hole; 10. Moving wheel; 11. Screw; 1101. External threaded connection part; 1102. Optical shaft part; 1103. Limiting part; 1104. Center hole; 1105. Stepped surface; 12. Roller; 13. Nylon sleeve; 14. Nut. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] As shown in the figure, a novel silent sofa bed frame includes a fixed frame 1 and a movable frame 2 movably mounted on the fixed frame 1. The fixed frame 1 is provided with a guide frame 9, which is welded to the fixed frame 1. Both the fixed frame 1 and the movable frame 2 are made of square tubing. The movable frame 2 is provided with a mounting frame 3. In this example, the mounting frame 3 has an L-shaped cross-section, and the length of the mounting frame 3 is less than the length of the movable frame 2 and the fixed frame 1. The mounting frame 3 is provided with a moving component that matches the guide frame 9. That is, the moving component serves as a guide and rolling structure for connecting the movable frame 2 and the fixed frame 1, allowing the movable frame 2 to move relative to the fixed frame 1.

[0036] Specifically, the moving component includes:

[0037] The screw 11 is provided with an external threaded connection part 1101, an optical shaft part 1102 and a limiting part 1103. The outer diameter of the external threaded connection part 1101, the optical shaft part 1102 and the limiting part 1103 increases sequentially. The stepped surface 1105 at the end of the optical shaft part 1102 abuts against the side wall of the mounting bracket 3.

[0038] A nylon sleeve 13 is fitted onto the optical axis portion 1102 of the screw 11 and is rotatable relative to the screw 11. The nylon sleeve 13 contacts and is rolledly connected to the guide frame 9.

[0039] The roller 12 is sleeved on the optical shaft portion 1102 at the end of the screw 11 away from the external threaded connection portion 1101, and can rotate relative to the screw 11. The roller 12 contacts and rolls with the guide frame 9.

[0040] In this design, the external threaded connection 1101 of the screw 11 passes through the mounting hole 301 on the surface of the mounting bracket 3, and the screw 11 is fixed to the mounting bracket 3 by the nut 14. This arrangement ensures that after the screw 11 is tightened, the nylon sleeve 13 and the roller 12 will not be squeezed in the axial direction. In this example, after the nylon sleeve 13 and the roller 12 are installed on the optical axis 1102 of the screw 11, they can move slightly in the axial direction. The specific range of movement can be controlled within 0.2mm-0.8mm. This is to avoid the problem of high friction caused by the two contacting the side of the mounting bracket 3 and the end face of the limiting part 1103 respectively, which is beneficial to improving the flexibility during use.

[0041] Specifically, the guide frame 9 is located on both sides of the fixed frame 1. The guide frame 9 is a square tube structure. A guide groove 901 is provided on the inner side of the guide frame 9. The guide groove 901 extends along the length of the guide frame 9 and is consistent with the movement trajectory of the movable frame 2. The nylon sleeve 13 is inserted into the guide groove 901. By using the nylon sleeve 13 to isolate the screw 11 from the metal guide frame 9, metal-to-metal contact can be prevented, thereby achieving a silent effect.

[0042] Specifically, the roller 12 is located inside the guide frame 9 and contacts the bottom wall 902 of the square tube structure of the guide frame 9. In this example, the roller 12 is made of nylon, or other plastic materials can also be used. It is mainly used to cooperate with the nylon sleeve 13 to achieve a double support effect, so as to avoid easy damage to the nylon sleeve 13 and extend the service life of both.

[0043] Specifically, the guide frame 9 has a process hole 903 on its outer side. The diameter of the process hole 903 is larger than the outer diameter of the roller 12. This arrangement allows the moving component to be moved to the location of the process hole 903 after it is damaged, making it easy to disassemble the screw 11 and replace the roller 12 or the nylon sleeve 13.

[0044] Specifically, the cross-sectional outline of the nylon sleeve 13 has a T-shaped structure or a straight-through structure, such as... Figure 4 As shown, the cross-sectional outline of the nylon sleeve 13 is T-shaped to prevent the guide frame 9 from directly contacting the mounting frame 3, thus achieving a noise reduction effect; as Figure 9 As shown, the cross-sectional outline of the nylon sleeve 13 is a straight-through structure, which can be used for quick assembly and disassembly of moving components.

[0045] Specifically, such as Figure 4As shown, the limiting part 1103 and the optical axis part 1102 are integrally formed. More specifically, in this structure, the center of the outer end face of the limiting part 1103 has a cross groove or a slot. During assembly, the front end of the wrench is placed in the cross groove or slot to tighten or loosen the front nut 14, thus preventing the screw 11 from slipping.

[0046] It is understood that in other embodiments, such as Figure 9 As shown, the limiting part 1103 and the optical axis part 1102 are connected by screws. With this configuration, during maintenance, only the limiting part 1103 needs to be disassembled to remove the roller 12 or the nylon sleeve 13, thus achieving the purpose of quick maintenance.

[0047] Specifically, the middle part of the fixed frame 1 is hinged to a first connecting rod 6, the end of the first connecting rod 6 is hinged to a second connecting rod 7, the end of the second connecting rod 7 is hinged to a third connecting rod 8, and the third connecting rod 8 is hinged to the upright plate 5 installed at the end of the movable frame 2.

[0048] After the movable frame 2 is extended to its limit position, the first connecting rod 6 is in a vertical state, and the second connecting rod 7 and the third connecting rod 8 are in a horizontal state. When the second connecting rod 7 and the third connecting rod 8 are in a horizontal state, the end of the second connecting rod 7 extends toward the third connecting rod 8 to form a positioning end 701. The positioning end 701 contacts the upper plane of the third connecting rod 8 to prevent the second connecting rod 7 from continuing to rotate relative to the third connecting rod 8 in a horizontal state.

[0049] The aforementioned linkage mechanism allows the sofa bed frame to function differently after being unfolded or folded. For example, a large mattress can be installed on the upper surface of the movable frame 2, a small mattress can be installed on the second linkage 7, and a backrest can be installed at the end of the fixed frame 1. When the movable frame 2 is unfolded, the large and small mattresses can be joined together to form a larger mattress for use as a bed; when the movable frame 2 is retracted, the small mattress can be retracted to one end of the fixed frame 1, and the large mattress can be moved horizontally back, thus enabling it to be used as a sofa.

[0050] Specifically, a movable wheel 10 is installed on the lower outer side of the movable frame 2, and an electric linear guide driver 4 is installed on the movable frame 2. The slider of the electric linear guide driver 4 is connected to the fixed frame 1 and is used to make the movable frame 2 move horizontally relative to the fixed frame 1 when started.

[0051] Specifically, the movable components are provided in at least two sets. In this example, there are two sets of movable components, which can effectively support and move the movable frame 2. The screw 11 has a through central hole 1104 in the middle. The cross-sectional shape of the central hole 1104 is a regular polygon. This is so that when assembling the screw 11, a hexagonal wrench can be inserted into the central hole 1104 and the screw 11 can be connected to the mounting frame 3 after passing through the process hole 903. At the same time, it also facilitates the assembly of the nut 14 and prevents slippage during tightening.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel silent sofa bed frame, characterized in that, It includes a fixed frame (1) and a movable frame (2) movably mounted on the fixed frame (1). The fixed frame (1) is provided with a guide frame (9), and the movable frame (2) is provided with a mounting frame (3). The mounting frame (3) is provided with a moving component that matches the guide frame (9). The moving component includes: The screw (11) is provided with an external threaded connection part (1101), an optical shaft part (1102) and a limiting part (1103). The outer diameter of the external threaded connection part (1101), the optical shaft part (1102) and the limiting part (1103) increases sequentially. The stepped surface (1105) at the end of the optical shaft part (1102) abuts against the side wall of the mounting bracket (3). A nylon sleeve (13) is fitted onto the optical axis portion (1102) of the screw (11) and is rotatable relative to the screw (11). The nylon sleeve (13) contacts and is rolledly connected to the guide frame (9). The roller (12) is sleeved on the optical shaft (1102) of the screw (11) at the end away from the external thread connection (1101) and can rotate relative to the screw (11). The roller (12) contacts and rolls with the guide frame (9).

2. The novel silent sofa bed frame according to claim 1, characterized in that: The guide frame (9) is located on both sides of the fixed frame (1). The guide frame (9) is a square tube structure. A guide groove (901) is provided on the inner side of the guide frame (9). The guide groove (901) extends along the length of the guide frame (9) and is consistent with the movement trajectory of the movable frame (2). The nylon sleeve (13) is inserted into the guide groove (901).

3. The novel silent sofa bed frame according to claim 2, characterized in that: The roller (12) is located inside the guide frame (9) and contacts the bottom wall (902) of the square tube structure of the guide frame (9).

4. The novel silent sofa bed frame according to claim 1, characterized in that: The guide frame (9) has a process hole (903) on its outer side, and the diameter of the process hole (903) is larger than the outer diameter of the roller (12).

5. A novel silent sofa bed frame according to claim 1, characterized in that: The cross-sectional outline of the nylon sleeve (13) is T-shaped or straight.

6. A novel silent sofa bed frame according to claim 1, characterized in that: The limiting part (1103) and the optical axis part (1102) are integrally formed or connected by screws.

7. A novel silent sofa bed frame according to claim 6, characterized in that: The external threaded connection (1101) of the screw (11) passes through the mounting hole (301) opened on the surface of the mounting bracket (3) and is fixed on the mounting bracket (3) by the nut (14).

8. A novel silent sofa bed frame according to claim 1, characterized in that: The fixed frame (1) is hinged to the middle of a first connecting rod (6), the end of the first connecting rod (6) is hinged to a second connecting rod (7), the end of the second connecting rod (7) is hinged to a third connecting rod (8), and the third connecting rod (8) is hinged to the upright plate (5) installed at the end of the movable frame (2). After the movable frame (2) is extended to its limit position, the first link (6) is in a vertical state, the second link (7) and the third link (8) are in a horizontal state, and when the second link (7) and the third link (8) are in a horizontal state, the end of the second link (7) extends toward the third link (8) to form a positioning end (701), and the positioning end (701) contacts the upper plane of the third link (8) to prevent the second link (7) from continuing to rotate relative to the third link (8) in a horizontal state.

9. A novel silent sofa bed frame according to claim 1, characterized in that: The movable frame (2) is equipped with a moving wheel (10) on its lower outer side. An electric linear guide driver (4) is installed on the movable frame (2). The slider of the electric linear guide driver (4) is connected to the fixed frame (1) and is used to make the movable frame (2) move horizontally relative to the fixed frame (1) when started.

10. A novel silent sofa bed frame according to claim 1, characterized in that: The moving component is provided with at least two sets, and the screw (11) has a through central hole (1104) in the middle, and the cross-sectional shape of the central hole (1104) is a regular polygon.

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