Fixed rail with anti-torsion section structure and drawer hidden rail

Abstract

The utility model relates to the technical field of drawer hidden rails, in particular to a fixed rail with a torsion-resistant section structure and a drawer hidden rail, which comprise a first horizontal section, a first vertical section and a second vertical section, the first vertical section and the second vertical section are respectively connected with two ends of the first horizontal section and are vertical to the first horizontal section, the first vertical section is used for being connected with a cabinet body, and the second vertical section is used for being connected with the cabinet body. The fixed rail comprises a first vertical section and a second vertical section, the second vertical section is used for being assembled with a movable rail in a sliding mode, the second vertical section is provided with a first bending portion, and the first bending portion is arranged in a bending mode from the top of the first vertical section to the side away from the second vertical section. The risk that the sliding rail is stressed and deformed is reduced, the reliability of the fixed rail structure is improved, meanwhile, the first bent part and the second bent part can play a role in limiting the movable rail, the falling risk when the drawer is pulled out is reduced, the pulling smoothness of the hidden rail is ensured, and the use experience of a user is improved.

Description

Technical Field

[0001] This utility model relates to the field of drawer concealment rail technology, and in particular to a fixed rail and drawer concealment rail with a torsional cross-section structure. Background Technology

[0002] Concealed drawer slides are a type of hardware transmission component that enables drawer push-pull functions through a concealed design. Its structure consists of a fixed slide, a moving slide, rolling elements, and a damping system.

[0003] In the existing technology, the fixed rail is formed into an L-shaped cross-section through a bending process and is used to connect the side panel or bottom panel of the cabinet, mainly serving a load-bearing function. The movable rail is slidably assembled with the fixed rail through rolling elements and is used to connect the drawer body, thereby realizing the extension and retraction movement of the drawer body.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: Firstly, because the L-shaped fixed rail only provides vertical restraint through a vertical folded edge, as the drawer body is pulled to the middle or rear section, the contact area between the movable rail and the fixed rail gradually decreases. This leads to a gradual reduction in the vertical constraint of the fixed rail on the movable rail. The outward shift of the movable rail's center of gravity creates a lever effect, generating a tipping moment and causing force imbalance. This can easily lead to the risk of the drawer body accidentally falling off, affecting user safety. Secondly, the L-shaped fixed rail has poor torsional resistance. Under heavy load on the drawer body, the fixed rail is prone to bending and deformation. Once the fixed rail deforms, it will affect the smoothness of the movable rail's sliding, causing drawer jamming and abnormal noises, impacting product reliability and user experience. Utility Model Content

[0005] To address the issue of poor torsional resistance of fixed rails, which negatively impacts user experience, this application provides a fixed rail and a drawer concealment rail with a torsional cross-sectional structure.

[0006] Firstly, the present invention provides a fixed rail with a torsional cross-section structure, which adopts the following technical solution:

[0007] A fixed rail with a torsional cross-section structure includes a first horizontal section, a first vertical section and a second vertical section respectively connected to both ends of the first horizontal section and perpendicular to the first horizontal section. The first vertical section is used to connect with a cabinet, and the second vertical section is used to slide with a movable rail. The second vertical section is provided with a first bending portion, which bends from the top of the first vertical section toward a side away from the second vertical section.

[0008] Preferably, the second vertical segment is further provided with a second bend, which bends from the top of the first bend toward the first vertical segment.

[0009] Preferably, it further includes a second horizontal segment, which is connected to the second bend and is arranged parallel to the first horizontal segment.

[0010] Preferably, the first bend is arranged in an arc shape, and the included angle α of the first bend is 60°±5°.

[0011] Preferably, the second bend is arranged in an arc shape, and the included angle b of the second bend is 150°±5°.

[0012] Preferably, the outer radius of the first bend is 2.1 to 2.4 times the thickness of the first vertical segment.

[0013] Preferably, the outer radius of the second bend is 0.4 to 0.5 times the outer radius of the first bend.

[0014] Preferably, a limiting part is provided at one end of the second horizontal segment, the limiting part is bent from the second horizontal segment toward the first horizontal segment, and the limiting part is offset from the first horizontal segment.

[0015] Preferably, a reinforcing part is provided at the connection between the first vertical segment and the first horizontal segment, and the reinforcing part is located at the end away from the limiting part.

[0016] Secondly, the drawer concealment slide provided by this utility model adopts the following technical solution:

[0017] A drawer concealment slide includes a fixed slide with a torsional cross-section structure as described above, and also includes a movable slide and a rolling element. The movable slide is slidably assembled with the fixed slide, and the rolling element is slidably assembled between the movable slide and the fixed slide.

[0018] The beneficial effects of this utility model are as follows:

[0019] By incorporating a first bend and a second bend, the lateral support and torque resistance of the fixed rail are enhanced, improving the reliability of the fixed rail structure, its torsional resistance, and its rigidity. This increases the load-bearing capacity and reduces the risk of deformation under stress, making the overall structure of the concealed rail robust and reliable, thus helping to ensure its service life. Furthermore, the concave structure of the first bend and the convex structure of the second bend create a limiting space. A limiting structure matching this space is provided for the movable rail and / or rolling elements, effectively limiting the movable rail and reducing the risk of it falling out when the drawer is pulled to its limit.

[0020] By incorporating a second horizontal section, the movable rail is supported, increasing the contact area between the movable rail and / or sliding parts and the fixed rail. This helps to distribute the load evenly and reduce stress concentration. At the same time, the increased contact area improves vertical constraint stability, reduces the overturning moment when the drawer is pulled outward, reduces the possibility of deformation of the hidden rail, and improves the smoothness of the drawer's sliding mechanism. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of a fixed rail in the prior art of Embodiment 1 of this application;

[0022] Figure 2 This is a cross-sectional view of the fixed rail in Embodiment 1 of this application;

[0023] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0024] Figure 4 This is a front view of the fixed rail in Embodiment 1 of this application;

[0025] Figure 5 This is a first perspective view of the fixed rail in Embodiment 1 of this application;

[0026] Figure 6 This is a second perspective view of the fixed rail in Embodiment 1 of this application;

[0027] Figure 7 This is a third perspective view of the fixed rail in Embodiment 1 of this application;

[0028] Figure 8 This is a schematic diagram of the first structure of the sliding bead frame in Embodiment 2 of this application;

[0029] Figure 9 This is a front view of the sliding bead holder in Embodiment 2 of this application;

[0030] Figure 10 yes Figure 9 Schematic diagram of the cross-sectional structure along the BB direction;

[0031] Figure 11 yes Figure 10 A magnified view of a portion of point C in the middle;

[0032] Figure 12 This is a schematic diagram of the second structure of the sliding bead frame in Embodiment 2 of this application;

[0033] Figure 13 This is a front view of the center rail in Embodiment 3 of this application;

[0034] Figure 14 This is the front view in Embodiment 3 of this application;

[0035] Figure 15 This is a perspective view of Embodiment 3 of this application;

[0036] Figure 16 This is a top view of Embodiment 3 of this application;

[0037] Figure 17 yes Figure 16 Schematic diagram of cross-sectional structure along the DD direction;

[0038] Figure 18 yes Figure 17 A magnified view of a portion of point E in the middle.

[0039] Explanation of reference numerals in the attached drawings: 1. First horizontal section; 101. Reinforcing part; 102. Hook part; 2. First vertical section; 201. Concave part; 3. Second vertical section; 301. First bending part; 302. Second bending part; 4. Second horizontal section; 401. Limiting part; 402. Cutout; 501. Fixed rail; 502. Movable rail; 5021. Middle rail; 5022. Outer rail; 503. Rolling element; 5031. Sliding ball holder; 5032. Movable ball holder; 6. Sliding element; 701. First fixed wing; 702. Second fixed wing; 703. Top plate; 7. Mounting groove; 8. Spacing groove; 9. Recessed groove; 10. Arc-shaped part; 1 11. First connecting section; 112. First bending section; 113. Second bending section; 121. First buffer groove; 122. Second buffer groove; 123. Third buffer groove; 13. Positioning protrusion; 14. Tooth; 151. First assembly groove; 152. Second assembly groove; 153. Third assembly groove; 161. First roller component; 162. Second roller component; 163. Third roller component; 17. Fixing groove; 181. Seventh horizontal section; 182. Third vertical section; 183. Fourth horizontal section; 184. Fifth vertical section; 185. Sixth horizontal section; 186. Third bending part; 187. Fourth bending part; 15. Arc groove. Detailed Implementation

[0040] This section will describe in detail the specific embodiments of this application. Preferred embodiments of this application are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so as to intuitively and vividly understand each technical feature and overall technical solution of this application, but they should not be construed as limiting the scope of protection of this application.

[0041] In the description of this application, if directional descriptions are involved, such as "up," "down," "front," "back," "left," "right," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, it is only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. When a feature is referred to as "set," "fixed," or "connected" to another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, or connected to the other feature.

[0042] In the description of this application, the term "several" means one or more, and "more than" means two or more. The terms "greater than," "less than," and "exceeding" should be understood as excluding the stated number, while "above," "below," and "within" should be understood as including the stated number. The terms "first" and "second" should be understood as distinguishing technical features and not as indicating or implying relative importance, the number of indicated technical features, or the order of the indicated technical features.

[0043] Furthermore, unless otherwise defined, the technical and scientific terms used in this application have the same meanings as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and not for limiting the application. It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof.

[0044] Example 1: As Figure 1-7 As shown, a fixed rail with a torsional cross-section structure includes a first horizontal section 1, a first vertical section 2 and a second vertical section 3 respectively connected to both ends of the first horizontal section 1 and perpendicular to the first horizontal section 1. The first vertical section 2 is used to connect with the cabinet body, and the second vertical section 3 is used to slide with the movable rail 502. The second vertical section 3 is provided with a first bending portion 301, which bends from the top of the first vertical section 2 toward the side away from the second vertical section 3. By providing the first bending portion 301, the moment of inertia of the fixed rail 501 is increased, thereby improving the overall structural stability, reducing the risk of deformation under heavy loads on the drawer, and helping to extend the service life of the concealed rail.

[0045] The connection between the first vertical segment 2 and the first horizontal segment 1 is an arc-shaped transition, and the connection between the second vertical segment 3 and the first horizontal segment 1 is also an arc-shaped transition. This helps to alleviate stress concentration and reduce the direction of deformation of the fixed rail 501.

[0046] To further enhance the structural inertia of the fixed rail 501, the second vertical section 3 is also provided with a second bend 302. The second bend 302 bends from the top of the first bend 301 toward the first vertical section 2. By providing the second bend 302, the load is evenly distributed, further improving the overall structural stability and reducing the risk of rail deformation caused by heavy drawers. In addition, a limiting space is formed between the concave structure of the first bend 301 and the convex structure of the second bend 302. Through the movable rail 502 and / or the rolling element 503, a limiting structure matching the limiting space is provided, which can limit the movable rail 502 and reduce the risk of the drawer falling off when it is pulled out to the limit position.

[0047] To increase the contact area between the movable rail 502 and the fixed rail 501, ensure the load-bearing capacity of the fixed rail 501, and prevent the risk of the movable rail 502 accidentally falling off the fixed rail 501, this embodiment also includes a second horizontal section 4. The second horizontal section 4 is connected to the second bend 302 and is arranged parallel to the first horizontal section 1. By providing the second horizontal section 4, the movable rail 502 is supported, increasing the contact area between the movable rail 502 and / or the sliding member and the fixed rail 501. This helps to distribute the load evenly and reduce stress concentration. At the same time, by increasing the contact area, the vertical constraint stability is improved, the overturning moment when the drawer is pulled out is reduced, the possibility of deformation of the hidden rail is reduced, and the smoothness of the drawer body is improved.

[0048] Regarding the specific structural design of the first bending portion 301, the first bending portion 301 is arranged in an arc shape, and the included angle α of the first bending portion 301 is 60°±5°. In one embodiment, the included angle α of the first bending portion 301 is 62°. By arranging it in an arc shape, stress concentration is mitigated. Furthermore, by designing the angle α, it is helpful to avoid motion interference of the movable rail 502 and improve the smoothness of the drawer body's movement.

[0049] Regarding the specific structural design of the second bending portion 302, the second bending portion 302 is arranged in an arc shape, and the included angle b of the second bending portion 302 is 150°±5°. In one embodiment, the included angle b of the second bending portion 302 is 152°. By arranging it in an arc shape, stress concentration is mitigated.

[0050] Regarding the specific structural design of the first bending portion 301 and the second vertical segment 3, the outer radius of the first bending portion 301 is 2.1 to 2.4 times the thickness of the first vertical segment 2. In one embodiment, the outer radius of the first bending portion 301 is 2.3 times the thickness of the first vertical segment 2, which is beneficial for balancing elastic deformation and structural stability. At the same time, it is beneficial for the bending process of the first bending portion 301, reducing the bending springback of the first bending portion 301 and ensuring the consistency of the processing quality of the fixed rail 501. It is worth mentioning that after the first bending portion 301 is bent into an arc shape, it will form a concentric inner circle and an outer circle, with the radius of the outer circle being larger than the radius of the inner circle. The thickness of the first vertical segment 2 is the thickness of the plate material used to make the first vertical segment 2.

[0051] Regarding the specific structural design of the first bend 301 and the second bend 302, the outer radius of the second bend 302 is 0.4 to 0.5 times the outer radius of the first bend 301. In one embodiment, the outer radius of the first bend 301 is 0.5 times the outer radius of the second bend 302. By designing the size of the first bend 301 and the second bend 302, the first bend 301 disperses the principal stress, and the second bend 302 strengthens the local support, thereby improving the overall torsional stiffness of the fixed rail 501 and reducing the risk of plastic deformation under heavy load conditions. It is worth mentioning that after the first bend 301 and the second bend 302 are bent into an arc shape, concentric inner and outer circles will be formed, with the radius of the outer circle being larger than the radius of the inner circle.

[0052] In order for the fixed rail 501 to limit the moving part, and thus limit the moving rail 502 to prevent the drawer body from accidentally slipping off, a limiting part 401 is provided at one end of the second horizontal segment 4. The limiting part 401 is bent from the second horizontal segment 4 toward the first horizontal segment 1. The limiting part 401 is misaligned with the first horizontal segment 1 to form a cut 402. The limiting part 401 designed by the misaligned cut 402 can block the outer wall of the sliding part, prevent the sliding part from slipping off, and thus improve the smoothness of the drawer body sliding.

[0053] The limiting part 401 is designed to be perpendicular to the third horizontal section, and the connection between the positioning part and the third horizontal section is an arc transition.

[0054] In order to improve the structural rigidity of the fixed rail 501, a reinforcing part 101 is provided at the connection between the first vertical section 2 and the first horizontal section 1. The reinforcing part 101 is located at the end away from the limiting part 401. Through the structural design of the reinforcing part 101, it plays the role of a reinforcing rib, thereby improving the connection strength between the first vertical section 2 and the first horizontal section 1. There are two sets of reinforcing parts 101, and the two sets of reinforcing parts 101 are arranged at intervals.

[0055] In terms of the specific structural design of the reinforcing part 101, the reinforcing part 101 is recessed inward from the connection between the first vertical segment 2 and the first horizontal segment 1, forming a protruding structure at the inner connection between the first vertical segment 2 and the first horizontal segment 1, and a recessed structure at the outer connection between the first vertical segment 2 and the first horizontal segment 1.

[0056] Regarding the specific structural design of the first vertical segment 2, the first vertical segment 2 is provided with a concave portion 201. The concave portion 201 is recessed from the first vertical segment 2 toward the second vertical segment 3. The concave portion 201 is parallel to the first vertical segment 2. By providing the concave portion 201, the bending stiffness of the fixed rail 501 is enhanced, which helps to improve the ability of the hidden rail to withstand lateral loads.

[0057] The first horizontal segment 1 is provided with a hook 102 for assembling the sliding part, and multiple sets of hooks 102 are provided.

[0058] Example 2: As Figure 8-12 As shown, a sliding bead frame for a fixed rail and a middle rail includes a sliding member 6, a top plate 703, a first fixed wing 701 and a second fixed wing 702 respectively connected to both sides of the top plate 703. The first fixed wing 701 is located between the fixed rail 501 and the middle rail 5021, and the second fixed wing 702 is used for sliding assembly with the middle rail 5021. The first fixed wing 701 has several sets of mounting grooves 7, which are arranged along the extension direction of the first fixed wing 701. The sliding member 6 is rotatably installed in the mounting groove 7. The sliding member 6 is spherical. By setting the sliding member 6 in a spherical shape, the load is transmitted, the coefficient of friction is lower, and the symmetrical structure of the spherical shape allows the sliding member 6 to rotate freely in any direction, so that the torque is uniform during rotation, there is no need to adjust the installation angle, and the installation cost is low.

[0059] The mounting groove 7 has two sets of opposite sidewalls with recessed grooves 9 respectively. The sliding member 6 is rotatably installed between the two sets of opposite recessed grooves 9. By setting recessed grooves 9 in the sidewalls of the mounting groove 7, space is provided for the sliding member 6, which facilitates the limiting installation of the sliding member 6.

[0060] The first fixed wing 701 is also provided with a spacer groove 8. Multiple sets of mounting grooves 7 are provided at intervals along the extension direction of the first fixed wing 701. The spacer groove 8 is provided between two adjacent sets of mounting grooves 7 to reduce stress concentration when the sliding member 6 slides between adjacent mounting grooves 7 and to provide buffer space for the sliding of multiple sets of sliding members 6.

[0061] The spacer groove 8 and the mounting groove 7 are alternately arranged on the first fixed wing 701. By setting the spacer groove 8 and the mounting groove 7 alternately, a buffer space is provided for the sliding member 6 inside the mounting groove 7 to slide, further reducing the stress concentration when the sliding member 6 slides and enhancing the stability of the sliding member 6.

[0062] The width of the mounting groove 7 is 1.5-1.7 times the width of the interval groove 8, preferably 1.6 times. By controlling the width ratio of the mounting groove 7 to the interval groove 8, the stress concentration of the sliding member 6 when sliding between adjacent mounting grooves 7 is further reduced, and the sliding effect is improved.

[0063] The width of the mounting groove 7 is 0.84-0.94 times the diameter of the slider 6, preferably 0.84 times, and the depth of the recessed groove 9 is 0.08-0.13 times the diameter of the slider 6, preferably 0.11 times. By controlling the ratio of the width of the mounting groove 7, the depth of the recess, and the diameter of the slider 6, friction or displacement caused by excessive tightness or looseness is avoided, ensuring that the slider 6 rolls stably and without jamming.

[0064] One end of the first fixed wing 701 is provided with an arc-shaped portion 10, which includes a first connecting section 111, a first bending section 112, and a second bending section 113 connected in sequence. The first bending section 112 is bent toward the top plate 703, and the second bending section 113 is bent away from the top plate 703. The bottom wall of the first bending section 112 is provided with a first buffer groove 121, and the top wall of the second bending section 113 is provided with a second buffer groove 122. A third buffer groove 123 is formed between the bottom wall of the second bending section 113 and the first fixed wing 701. By setting the first buffer groove 121, the second buffer groove 122, and the third buffer groove 123, external stress is dispersed, providing buffer space for the installation and sliding of the sliding bead frame 5031.

[0065] The first fixed wing 701 is also provided with a positioning protrusion 13, which protrudes from the arc-shaped part 10 toward the second fixed wing 702. The positioning protrusion 13 improves the assembly stability of the sliding ball frame 5031 and the second bent part 302 in the fixed rail 501.

[0066] The inner wall of the first fixed wing 701 is provided with an arc-shaped groove 15, and the central angle c of the arc-shaped groove 15 is 140±5°. In one embodiment, the central angle c is 140°. By setting the arc-shaped groove 15, stress concentration is alleviated and assembly stability is further improved.

[0067] The top of the first fixed wing 701 is provided with multiple sets of teeth 14. The teeth 14 are used to limit the installation components of the middle rail 5021 and prevent loosening during sliding.

[0068] It also includes a first roller component 161. The top wall of the top plate 703 is provided with several sets of first assembly grooves 151. The first assembly grooves 151 are arranged along the extension direction of the top plate 703. The first roller component 161 is rotatably assembled in the first assembly groove 151. The arrangement of the first roller component 161 reduces the friction between the sliding ball frame 5031 and the inner top wall of the middle rail 5021, thereby improving the performance.

[0069] It also includes a second roller member 162. The bottom wall of the second fixed wing 702 is provided with several sets of second assembly grooves 152. The second assembly grooves 152 are arranged along the extension direction of the second fixed wing 702. The second roller member 162 is rotatably assembled in the second assembly groove 152. The arrangement of the second roller member 162 reduces the friction between the sliding ball frame 5031 and the fixed rail 501, thereby improving the performance.

[0070] It also includes a third roller component 163. The outer side wall of the second fixed wing 702 is provided with a third assembly groove 153. The third roller component 163 is rotatably assembled in the third assembly groove 153. The setting of the third roller component 163 reduces the friction between the sliding ball frame 5031 and the inner side wall of the middle rail 5021, thereby improving the performance.

[0071] The inner wall of the second fixed wing 702 is provided with a fixing groove 17, which is connected to the first assembly groove 151 and a portion of the first roller 161 is located in the fixing groove 17. The fixing groove 17 is connected to the second assembly groove 152 and a portion of the second roller 162 is located in the fixing groove 17. The fixing rail 501 is located in the fixing groove 17. The fixing groove 17 facilitates the assembly of the fixing rail 501.

[0072] This embodiment provides a specific design dimension: the diameter of the sliding member 6 is 4.4 mm, the width of the mounting groove 7 is 3.7 mm, the width of the interval groove 8 is 2.3 mm, the width of the recessed groove 9 is 0.5 mm, there are four sets of mounting grooves 7, four sets of interval grooves 8, eight sets of recessed grooves 9, two sets of arc-shaped parts 10, two sets of positioning protrusions 13, eight sets of first assembly grooves 151, eight sets of first roller members 161, eight sets of second assembly grooves 152, eight sets of second roller members 162, two sets of first assembly grooves 151, two sets of third roller members 163, and the central angle c is 140°.

[0073] The implementation principle of a sliding ball frame for a fixed rail and a center rail in this embodiment is as follows: the spherical sliding member 6 rolls omnidirectionally in the mounting groove 7 by utilizing the symmetry of the spherical sliding member 6; the recessed groove 9 facilitates the limiting installation of the sliding member 6; the spacer groove 8 and the mounting groove 7 are arranged alternately to disperse stress and achieve a buffering effect; multiple sets of roller members are set to act on the top, bottom and side contact surfaces of the sliding ball frame 5031 respectively, reducing the friction between the sliding ball frame 5031 and other components and improving the smoothness of sliding. The overall structure replaces sliding friction with rolling friction, achieving low resistance and high stability of track sliding.

[0074] Example 3: As Figure 1-18 As shown, a drawer concealment rail includes a fixed rail with a torsional cross-section structure as described in Embodiment 1, and also includes a movable rail 502 and a rolling element 503. The movable rail 502 is slidably assembled with the fixed rail 501, and the rolling element 503 is slidably assembled between the movable rail 502 and the fixed rail 501.

[0075] In one embodiment, the drawer concealed rail is a three-section concealed rail. The movable rail 502 includes a middle rail 5021 and an outer rail 5022. The rolling element 503 includes a movable ball holder 5032 and a sliding ball holder 5031 for fixing the rail 501 and the middle rail 5021 as described in Embodiment 2. The sliding ball holder 5031 is slidably assembled between the movable rail 502 and the fixed rail 501, and the movable ball holder 5032 is slidably assembled between the middle rail 5021 and the outer rail 5022.

[0076] Among them, the fixed rail 501 is slidably assembled with the middle rail 5021, the middle rail 5021 is slidably assembled with the outer rail 5022, and the sliding ball frame 5031 is assembled between the fixed rail 501 and the middle rail 5021.

[0077] The fixed rail 501 includes a first horizontal section 1, a first vertical section 2 and a second vertical section 3 connected to both ends of the first horizontal section 1 and perpendicular to the first horizontal section 1, respectively. The first vertical section 2 is used to connect with the cabinet, and the second vertical section 3 is used to slide and assemble with the middle rail 5021. The second vertical section 3 is provided with a first bending part 301, which bends from the top of the first vertical section 2 toward the side away from the second vertical section 3. The second vertical section 3 is also provided with a second bending part 302, which bends from the top of the first bending part 301 toward the first vertical section 2. A limiting space is formed between the first bending part 301 and the second bending part 302. The sliding bead holder 5031 is located in the limiting space. By setting the first limiting space in the fixed rail 501, the sliding bead holder 5031 is easily limited, preventing the sliding bead holder 5031 from falling off when sliding.

[0078] The middle rail 5021 includes a seventh horizontal segment 181. A third vertical segment 182, a fourth horizontal segment 183, a fifth vertical segment 184, and a sixth horizontal segment 185 are sequentially connected from one end of the seventh horizontal segment 181. At the connection between the fifth vertical segment 184 and the sixth horizontal segment 185, a third bend 186 and a fourth bend 187 are formed sequentially from the outside inwards. The third bend 186 bends from the bottom end of the fifth vertical segment 184 towards the direction close to the fixed rail 501. The fourth bend 187... The bottom end of the fifth vertical segment 184 is bent away from the fixed rail 501. A stop space is formed between the fifth vertical segment 184 and the fourth bend 187. The sliding ball holder 5031 is located in the stop space. The sliding ball holder 5031 is blocked by the third bend 186 on the outside of the middle rail 5021 to prevent it from slipping. The stop space is set on the inside of the middle rail 5021 to limit the sliding ball holder 5031 and prevent it from falling off when it slides.

[0079] The second bend 302 is located diagonally above the slider 6, and the fourth bend 187 is located diagonally below the slider 6. The second bend 302 and the fourth bend 187 are arranged opposite to each other. The second bend 302 and the fourth bend 187, which are arranged opposite to each other and diagonally up and down, facilitate the limiting of the sliding bead holder 5031 and improve the stability during sliding.

[0080] The implementation principle of a drawer concealed rail in this embodiment is as follows: the drawer concealed rail achieves stable sliding and anti-fall-off function through the multi-segment bending structure of the fixed rail 501 and the movable rail 502. The second vertical segment 3 of the fixed rail 501 forms a limiting space through the first bending part 301 and the second bending part 302. The stop space formed by the fifth vertical segment 184 and the fourth bending part 187 of the middle rail 5021 is set opposite to the limiting space of the fixed rail 501. The bidirectional limiting is formed by the bending structure in the diagonal up and down direction. In addition, a third bending part 186 is set on the outside of the middle rail 5021 to prevent the sliding ball holder 5021 from shifting laterally or falling off during the sliding process, so as to realize the smooth push and pull and reliable positioning of the drawer in the concealed state.

[0081] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A fixed rail with a torsional cross-section structure, comprising a first horizontal section, a first vertical section and a second vertical section respectively connected to both ends of the first horizontal section and perpendicular to the first horizontal section, wherein the first vertical section is used to connect to a cabinet, and the second vertical section is used to slide with a movable rail, characterized in that: The second vertical segment is provided with a first bend, which bends from the top of the first vertical segment toward a side away from the second vertical segment.

2. A fixed rail with a torsional cross-section structure according to claim 1, characterized in that: The second vertical segment is further provided with a second bend, which bends from the top of the first bend toward the first vertical segment.

3. A fixed rail with a torsional cross-section structure according to claim 2, characterized in that: It also includes a second horizontal segment, which is connected to the second bend and is arranged parallel to the first horizontal segment.

4. A fixed rail with a torsional cross-section structure according to claim 1, characterized in that: The first bend is arc-shaped, and the included angle α of the first bend is 60°±5°.

5. A fixed rail with a torsional cross-section structure according to claim 2, characterized in that: The second bend is arc-shaped, and the included angle b of the second bend is 150°±5°.

6. A fixed rail with a torsional cross-section structure according to claim 1, characterized in that: The outer radius of the first bend is 2.1 to 2.4 times the thickness of the first vertical segment.

7. A fixed rail with a torsional cross-section structure according to claim 2, characterized in that: The outer radius of the second bend is 0.4 to 0.5 times the outer radius of the first bend.

8. A fixed rail with a torsional cross-section structure according to claim 3, characterized in that: A limiting part is provided at one end of the second horizontal segment. The limiting part is bent from the second horizontal segment toward the first horizontal segment and is offset from the first horizontal segment.

9. A fixed rail with a torsional cross-section structure according to claim 8, characterized in that: A reinforcing part is provided at the connection between the first vertical segment and the first horizontal segment, and the reinforcing part is located at the end away from the limiting part.

10. A drawer concealed slide, characterized in that: The fixed rail with a torsional cross-section structure as described in any one of claims 1 to 9 further includes a movable rail and a rolling element, wherein the movable rail is slidably assembled with the fixed rail and the rolling element is slidably assembled between the movable rail and the fixed rail.

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