A two-section hidden rail

Abstract

This utility model relates to the field of hardware accessories technology, specifically disclosing a two-section concealed rail, comprising an upper rail, a rolling mechanism, and a bottom rail. The bottom rail has a U-shaped mounting groove; the upper rail is composed of a first upper rail portion and second and third upper rail portions extending downward on both sides, together forming a receiving groove to accommodate the rolling mechanism. The rolling mechanism is sleeved on one side of the mounting groove, allowing the upper rail to be slidably mounted on the bottom rail. A first reinforcing rib is provided along the length direction at the connection between the first and second upper rail portions. This structure effectively disperses stress concentration, increases the moment of inertia of the cross section, thereby enhancing bending and deformation resistance. This rail is suitable for connecting drawers and cabinets, with the bottom rail fixed to the cabinet and the upper rail installed in the drawer. Without increasing cost or weight, the load-bearing capacity is increased to over 25 kg, preventing elastic or plastic deformation under high loads, ensuring long-term smooth and stable operation, and meeting the high load-bearing and high reliability requirements of heavy furniture such as TV cabinets and storage cabinets.

Description

Technical Field

[0001] This utility model relates to the field of hardware accessories technology, specifically to a two-section concealed rail. Background Technology

[0002] Currently, the two-section concealed drawer slides commonly found on the market are widely used in furniture, cabinets, bathroom fixtures and other fields. Their basic structure usually includes a fixed rail (bottom rail) and a sliding rail (top rail). They are smoothly pulled out through a ball bearing or roller system and are completely hidden inside the drawer or cabinet when closed, which is both aesthetically pleasing and space-saving.

[0003] Traditional two-section concealed drawer slides are mostly made of cold-rolled steel sheets through stamping and bending. Structurally, they rely on the elasticity of the material and the forming angle to ensure strength and sliding performance. Their working principle is to open and close the drawer through rolling friction between the slides, while the interlocking structure between the slides provides a certain degree of lateral and longitudinal support.

[0004] However, existing two-section concealed rails have the following problems in actual use: limited load-bearing capacity: they generally bear about 15 kg, which is difficult to meet the needs of high load-bearing scenarios such as TV cabinets and storage cabinets; easy structural deformation: under high load conditions, elastic deformation or even plastic deformation can easily occur at the bends of the rails, causing the rails to open or misalign, affecting service life and safety.

[0005] In summary, existing two-section concealed rails generally suffer from insufficient structural strength, resulting in limited load-bearing capacity (approximately 15 kg) and susceptibility to deformation and misalignment under high loads. Summary of the Invention

[0006] The purpose of this invention is to solve the problem that existing two-section concealed rails generally have limited load-bearing capacity due to insufficient structural strength, and to provide a new type of two-section concealed rail.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: The two-section concealed rail includes an upper rail, a rolling mechanism, and a bottom rail. A U-shaped mounting groove is formed on the bottom rail. The upper rail includes a first upper rail portion and a second upper rail portion and a third upper rail portion extending downward from both sides of the first upper rail portion. A receiving groove is formed between the first upper rail portion and the second and third upper rail portions. The rolling mechanism is located in the receiving groove and is sleeved on one side of the mounting groove, so that the upper rail is sleeved on the mounting groove by the rolling mechanism. A first reinforcing rib is provided at the connection between the first upper rail portion and the second upper rail portion along the length direction of the upper rail.

[0008] This utility model's two-section concealed rail can be used to connect drawers and cabinets. The bottom rail is fixed to the cabinet via a first bottom rail section, while the top rail is fixed to the drawer via a first top rail section. Reinforcing ribs are incorporated at the bends of the first, second, and third top rail sections. This reinforced design disperses stress concentration and increases the moment of inertia, significantly enhancing the rail's resistance to bending and deformation. This solution significantly increases the rail's load-bearing capacity to over 25 kg without increasing cost or weight, effectively preventing elastic or plastic deformation under high load conditions. It also ensures the drawer remains smooth and stable during long-term operation, fully meeting the high-load-bearing and high-reliability rail requirements of heavy furniture such as TV cabinets and storage cabinets.

[0009] Furthermore, the upper rail is manufactured using a stamping and bending integrated forming process, and the first reinforcing rib is a rib formed by stretching the bent part of the upper rail into the receiving groove. Unlike traditional welding or splicing methods for reinforcing ribs, this solution uses die stamping and stretching to integrally form the reinforcing rib with the upper rail body. This completely eliminates the quality risks such as thermal stress, incomplete welding, and weld failure that may be caused by welding, resulting in a more robust product structure and higher reliability. The rib structure can effectively disperse and offset the concentrated stress generated by the rail when bearing heavy objects (such as a fully loaded drawer), preventing elastic deformation (temporary bending) or plastic deformation (permanent bending) of the rail due to stress concentration. This greatly ensures the straightness and stability of the guide rail.

[0010] Furthermore, the bottom rail includes a first bottom rail portion and a second bottom rail portion and a third bottom rail portion that are longitudinally connected to both sides of the first bottom rail portion. The mounting groove is formed between the first bottom rail portion and the second bottom rail portion and the third bottom rail portion, and the rolling mechanism is sleeved on the third bottom rail portion.

[0011] Furthermore, the upper end of the third bottom rail portion is provided with a fourth bottom rail portion protruding towards the center of the mounting groove. The upper rail also includes a fourth upper rail portion, which is laterally connected to the lower side of the second upper rail portion and forms a clearance passage with the third upper rail portion. The first upper rail portion and the fourth upper rail portion are respectively rolled to the upper and lower surfaces of the fourth bottom rail portion via rolling mechanisms, and the third upper rail portion is rolled to the third bottom rail portion via a rolling mechanism. This solution creates rolling constraints in multiple directions (up / down and left / right) between the upper rail and the bottom rail. It acts like a built-in "bearing track system," transforming sliding friction into rolling friction, which is not only smoother but, more importantly, precisely confines the upper rail to the predetermined space of the bottom rail, eliminating any unnecessary shaking and gaps, and achieving extremely high motion accuracy and connection rigidity.

[0012] Furthermore, the rolling mechanism includes a first connecting frame disposed between the first upper rail portion of the upper rail and the fourth bottom rail portion of the bottom rail; the first connecting frame has a downwardly extending second connecting frame and a third connecting frame; the lower end of the second connecting frame is connected to the fourth connecting frame; rollers are provided on the first connecting frame, the third connecting frame and the fourth connecting frame.

[0013] Furthermore, the fourth connecting frame is provided with a fourth roller parallel to the Y-axis and a fifth roller parallel to the X-axis. The fourth connecting frame is tactilely connected to the second upper rail via the fifth roller, and tactilely connected to the fourth bottom rail and the fourth upper rail via the fourth roller.

[0014] Furthermore, the first reinforcing rib is also provided at the connection between the second upper rail and the fourth upper rail.

[0015] Furthermore, a second reinforcing rib is provided between the first bottom rail portion and the second bottom rail portion, and the second reinforcing rib is triangular in shape.

[0016] Furthermore, the bottom rail is manufactured using a stamping and bending integral forming process, and the second reinforcing rib is a rib formed by stretching the bent part of the bottom rail into the mounting groove.

[0017] Furthermore, there are at least two second reinforcing ribs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the two hidden rails; Figure 2 This is a structural diagram of the bottom rail; Figure 3 This is a structural diagram of the upper rail; Figure 4 This is a schematic diagram of the rolling mechanism. Figure 1 ; Figure 5 This is a schematic diagram of the rolling mechanism. Figure 2 .

[0019] Label Explanation: Upper rail 1, receiving groove 10, first upper rail part 11, second upper rail part 12, third upper rail part 13, fourth upper rail part 14, first reinforcing rib 15, bottom rail 3, mounting groove 30, first bottom rail part 31, second bottom rail part 32, third bottom rail part 33, fourth bottom rail part 34, rolling mechanism 2, first connecting frame 21, second connecting frame 22, third connecting frame 23, fourth connecting frame 24, fourth roller 25, fifth roller 26, first roller 27, second roller 28. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings: In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "front", "rear", "inner", and "outer" is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing this utility model and simplifying the description, and does 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, it should not be construed as a limitation of this utility model.

[0021] See Figure 1-4 As shown, this utility model discloses a two-section concealed rail, including an upper rail 1, a rolling mechanism 2, and a bottom rail 3. A U-shaped mounting groove 30 is formed on the bottom rail 3. The upper rail 1 includes a first upper rail portion 11 and a second upper rail portion 12 and a third upper rail portion 13 extending downward from both sides of the first upper rail portion 11. A receiving groove 10 is formed between the first upper rail portion 11 and the second upper rail portion 12 and the third upper rail portion 13. The rolling mechanism 2 is located in the receiving groove 10 and is sleeved on one side of the mounting groove 30, so that the upper rail 1 is sleeved on the mounting groove 30 by the rolling mechanism 2. A first reinforcing rib 15 is provided at the connection between the first upper rail portion 11 and the second upper rail portion 12 along the length direction of the upper rail 1.

[0022] Furthermore, the upper rail 1 is manufactured using a stamping and bending integrated forming process, and the first reinforcing rib 15 is a rib formed by stretching the bent part of the upper rail 1 into the receiving groove 10. Unlike traditional welding or splicing methods for reinforcing ribs, this solution uses die stamping and stretching to integrally form the reinforcing rib with the upper rail 1 body. This completely eliminates the quality risks such as thermal stress, incomplete welding, and weld failure that may be caused by welding, resulting in a more robust product structure and higher reliability. The rib structure can effectively disperse and offset the concentrated stress generated by the rail when bearing heavy objects (such as a fully loaded drawer), preventing elastic deformation (temporary bending) or plastic deformation (permanent bending) of the rail due to stress concentration. This greatly ensures the straightness and stability of the guide rail.

[0023] Furthermore, the bottom rail 3 includes a first bottom rail portion 31 and a second bottom rail portion 32 and a third bottom rail portion 33 longitudinally connected to both sides of the first bottom rail portion 31. The mounting groove 30 is formed between the first bottom rail portion 31 and the second bottom rail portion 32 and the third bottom rail portion 33. The rolling mechanism 2 is sleeved on the third bottom rail portion 33.

[0024] Furthermore, the upper end of the mounting groove 30 is provided with a fourth bottom rail portion 34 protruding towards the center of the mounting groove 30. The upper rail 1 also includes a fourth upper rail portion 14, which is laterally connected to the lower side of the second upper rail portion 12 and forms a clearance passage with the third upper rail portion 13. The first upper rail portion 11 and the fourth upper rail portion 14 are respectively rolledly connected to the upper and lower surfaces of the fourth bottom rail portion 34 through the rolling mechanism 2, and the third upper rail portion 13 is rolledly connected to the third bottom rail portion 33 through the rolling mechanism 2. This solution creates rolling constraints in multiple directions (up and down, left and right) between the upper rail 1 and the bottom rail 3. It is like a built-in "bearing track system," changing sliding friction into rolling friction, which is not only smoother, but more importantly, it precisely confines the upper rail 1 to move within the predetermined space of the bottom rail 3, eliminating any unnecessary shaking and gaps, and achieving extremely high motion accuracy and connection rigidity.

[0025] Furthermore, the rolling mechanism 2 includes a first connecting frame 21, which is disposed between the first upper rail portion 11 of the upper rail 1 and the fourth bottom rail portion 34 of the bottom rail 3; the first connecting frame 21 has a second connecting frame 22 and a third connecting frame 23 extending downward; the lower end of the second connecting frame 22 is connected to a fourth connecting frame 24; rollers are provided on the first connecting frame 21, the third connecting frame 23 and the fourth connecting frame 24.

[0026] Furthermore, the fourth connecting frame 24 is provided with a fourth roller 25 parallel to the Y-axis and a fifth roller 26 parallel to the X-axis. The fourth connecting frame 24 is rotatably connected to the second upper rail portion 12 through the fifth roller 26, and rotatably connected to the fourth bottom rail portion 34 and the fourth upper rail portion 14 through the fourth roller 25.

[0027] Furthermore, the first connecting frame is provided with a first roller 27 parallel to the X-axis, and the third connecting frame is provided with a second roller 28 parallel to the Y-axis.

[0028] Furthermore, the first reinforcing rib 15 is also provided at the connection between the second upper rail portion 12 and the fourth upper rail portion 14.

[0029] Furthermore, a second reinforcing rib is provided between the first bottom rail portion 31 and the second bottom rail portion 32.

[0030] Furthermore, the bottom rail 3 is manufactured by a stamping and bending integral forming process, and the second reinforcing rib is a rib formed by stretching the bent part of the bottom rail 3 towards the mounting groove.

[0031] Furthermore, there are at least two second reinforcing ribs.

[0032] This utility model's two-section concealed rail can be applied to the connection between drawers and cabinets. The bottom rail 3 is fixed to the cabinet via the first bottom rail portion 31, while the upper rail 1 is fixed to the drawer via the first upper rail portion 11. Reinforcing ribs are provided at the bends of the first upper rail portion 11, the second upper rail portion 12, and the third upper rail portion 13 of the upper rail 1. This reinforced design disperses stress concentration and increases the moment of inertia of the cross-section, thereby significantly enhancing the rail's resistance to bending and deformation. This solution significantly increases the load-bearing capacity of the guide rail to over 25 kg without increasing cost or weight, effectively preventing elastic or plastic deformation of the rail under high load conditions, while ensuring that the drawer remains smooth and stable during long-term operation. It thoroughly meets the needs of heavy furniture such as TV cabinets and storage cabinets for high-load-bearing and high-reliability guide rails.

[0033] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A two-section concealed rail, characterized in that, The device includes an upper rail (1), a rolling mechanism (2), and a bottom rail (3). A U-shaped mounting groove (30) is formed on the bottom rail (3). The upper rail (1) includes a first upper rail portion (11) and a second upper rail portion (12) and a third upper rail portion (13) extending downward from both sides of the first upper rail portion (11). A receiving groove (10) is formed between the first upper rail portion (11), the second upper rail portion (12), and the third upper rail portion (13). The rolling mechanism (2) is located in the receiving groove (10) and is sleeved on one side of the mounting groove (30), so that the upper rail (1) is sleeved on the mounting groove (30) through the rolling mechanism (2). A first reinforcing rib (15) is provided at the connection between the first upper rail portion (11) and the second upper rail portion (12) along the length direction of the upper rail (1).

2. The two-section concealed rail according to claim 1, characterized in that, The upper rail (1) is made by stamping and bending integral forming process, and the first reinforcing rib (15) is a rib formed by stretching the bent part of the upper rail (1) into the receiving groove (10).

3. The two-section concealed rail according to claim 2, characterized in that, The bottom rail (3) includes a first bottom rail portion (31) and a second bottom rail portion (32) and a third bottom rail portion (33) longitudinally connected to both sides of the first bottom rail portion (31). The mounting groove (30) is formed between the first bottom rail portion (31), the second bottom rail portion (32), and the third bottom rail portion (33). The rolling mechanism (2) is sleeved on the third bottom rail portion (33).

4. The two-section concealed rail according to claim 3, characterized in that, The upper end of the third bottom rail (33) is provided with a fourth bottom rail (34) protruding towards the center of the mounting groove (30). The upper rail (1) also includes a fourth upper rail (14). The fourth upper rail (14) is laterally connected to the lower side of the second upper rail (12) and forms a clearance passage with the third upper rail (13). The first upper rail (11) and the fourth upper rail (14) are respectively connected to the upper and lower surfaces of the fourth bottom rail (34) by a rolling mechanism (2), and the third upper rail (13) is connected to the third bottom rail (33) by a rolling mechanism (2).

5. The two-section concealed rail according to claim 4, characterized in that, The rolling mechanism (2) includes a first connecting frame (21), which is disposed between the first upper rail portion (11) of the upper rail (1) and the fourth bottom rail portion (34); the first connecting frame (21) has a second connecting frame (22) and a third connecting frame (23) extending downward; the lower end of the second connecting frame (22) is connected to a fourth connecting frame (24); rollers are provided on the first connecting frame (21), the third connecting frame (23) and the fourth connecting frame (24).

6. The two-section concealed rail according to claim 5, characterized in that, The fourth connecting frame (24) is provided with a fourth roller (25) parallel to the Y-axis and a fifth roller (26) parallel to the X-axis. The fourth connecting frame (24) is tactilely connected to the second upper rail (12) through the fifth roller (26), and tactilely connected to the fourth bottom rail (34) and the fourth upper rail (14) through the fourth roller (25).

7. The two-section concealed rail according to claim 4, characterized in that, The first reinforcing rib (15) is also provided at the connection between the second upper rail portion (12) and the fourth upper rail portion (14).

8. The two-section concealed rail according to claim 7, characterized in that, A second reinforcing rib is provided between the first bottom rail part (31) and the second bottom rail part (32). The second reinforcing rib is triangular in shape and perpendicular to the movement direction of the upper rail (1).

9. The two-section concealed rail according to claim 8, characterized in that, The bottom rail (3) is made by stamping and bending integral forming process, and the second reinforcing rib is a rib formed by stretching the bent part of the bottom rail (3) into the mounting groove (30).

10. The two-section concealed rail according to claim 8, characterized in that, The second reinforcing rib has at least two parts.

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