Hidden slide rail device

Abstract

The application belongs to the technical field of slide rail devices, and the hidden slide rail device is characterized in that when the external guide rail is relatively retracted, the guide on the supporting piece can accurately guide the swing cam to swing and enter the clamping groove, and when the swing cam swings to the top supporting limiting part, the swing cam is limited in the lifting state, so that the external guide rail and the gravity carried thereby are transferred from the first sliding connection structure to the top supporting assembly, the first sliding connection structure and other moving parts are free from pressure in the long-term static bearing state, and the sinking, creep, wear caused by the static load and the increased movement resistance, increased noise and decreased smoothness caused thereby are effectively avoided; when the external guide rail is relatively slid out, the supporting piece directly drives the swing cam to reversely swing and is limited in the sliding-out limiting part, the swing cam is lowered and separated from the clamping groove, the gravity is transferred back to the first sliding connection structure, and the time-sharing switching of the static bearing and the dynamic movement is realized.

Description

Technical Field

[0001] This invention belongs to the technical field of slide rail devices, specifically relating to a concealed slide rail device. Background Technology

[0002] Concealed slide rails are linear motion guiding structures that hide the main body of the rail within the mounting base. They are widely used in applications requiring compact design, dustproof aesthetics, or prevention of interference from exposed components, such as drawer slides, industrial sliding doors, equipment safety doors, and various sliding load-bearing mechanisms. In this type of structure, moving parts (such as slide blocks, sliders, or rollers) roll or slide within the internal channels of the concealed slide rail, thereby achieving low-friction linear motion.

[0003] However, existing concealed slide rail structures have the following technical shortcomings: Rollers or sliders bear static loads for extended periods, leading to sagging and wear. In concealed slide rail systems, moving parts (especially rollers) still bear all or most of the load even when the equipment is stationary. Prolonged static pressure can cause creep, flattening deformation of the roller material, or increased bearing clearance, resulting in sagging of the moving parts. The sagging parts will then experience abnormal friction with the bottom or sidewalls of the concealed slide rail, causing increased motion resistance, higher operating noise, and a significant decrease in smoothness.

[0004] Existing improvement methods are limited by the confined space of the concealed slide rail, resulting in limited effectiveness. To alleviate roller deformation under stress, conventional approaches include increasing the number of rollers, increasing roller diameter, or using higher-strength materials. However, the internal height and width of the concealed slide rail limit further increases in roller size. Lubrication and maintenance can only slow down dynamic wear and cannot eliminate permanent deformation caused by static loads. Therefore, the contradiction between the service life of the concealed slide rail system and long-term smoothness of operation persists. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hidden slide rail device that can eliminate static loads by moving parts.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The concealed slide rail device includes a fixed guide rail component, an external guide rail component, a top support assembly, and a support component.

[0007] The fixed guide rail has a support edge extending along the inner side and a fixed guide portion located at the inner end of the support edge.

[0008] An external guide rail is provided, and a first sliding connection structure is provided between the external guide rail and the fixed guide rail. The external guide rail is guided by the sliding connection structure and can slide out or retract relative to the external guide rail.

[0009] The top support assembly, located on the outer side of the outer guide rail on the support edge, includes a top support seat and a swing cam. The top support seat has a swing movable cavity with an upper opening. The lower part of the swing cam is rotatably connected to the swing movable cavity and can swing relative to the sliding direction of the outer guide rail. The upper part of the swing cam extends out of the swing movable cavity to form a top support part. The top support seat has a sliding limit part on the side of the swing cam along the sliding direction of the outer guide rail and a top support limit part on the side of the swing cam along the retraction direction of the outer guide rail. The swing cam swings between the sliding limit part and the retraction limit part. The top support limit part is used to keep the swing cam in a raised state, and the sliding limit part is used to lower the swing cam.

[0010] The support member is located on the outside of the outer guide rail and has a card slot with an opening at the lower end and a guide member located on the side of the card slot along the sliding direction of the outer guide rail. The guide member extends out of the lower side of the support member and smoothly transitions with the lower end of the side of the card slot. The guide member is used to drive the swing cam to swing and enter the card slot when the outer guide rail is retracted. When the swing cam swings to the top support limit part, it supports the outer guide rail and transfers the weight supported by the outer guide rail from the first sliding connection structure to the swing cam. When the outer guide rail slides out, the support member drives the swing cam to swing synchronously, so that the swing cam swings downward and is limited to the sliding limit part and disengages from the card slot, thereby transferring the weight supported by the outer guide rail from the swing cam to the first sliding connection structure to continue sliding outward.

[0011] Compared with the prior art, the concealed slide rail device of the present invention, through the cooperation of the top support assembly and the support member, allows the guide member on the support member to accurately guide the swinging cam to swing and enter the card slot when the external guide rail is retracted. When the swinging cam swings to the top support limit part, it is limited to the lifting state, thereby transferring the external guide rail and its load from the first sliding connection structure to the top support assembly. This prevents the moving parts such as the first sliding connection structure from being compressed under long-term static load, effectively avoiding sinking, creep, wear caused by static load, as well as the resulting increase in motion resistance, noise, and smoothness. The degree of decrease; when the external guide rail slides out relative to the external guide rail, the support directly drives the swing cam to swing in the opposite direction and limit it to the sliding limit part, so that the swing cam descends and disengages from the card slot, and the gravity is transferred back to the first sliding connection structure, ensuring low friction performance during dynamic operation. The entire mechanism realizes the time-sharing switching between static load and dynamic movement in the narrow space of the hidden slide rail, without increasing the roller diameter, increasing the number of rollers, or relying on frequent lubrication. It fundamentally solves the contradiction between the service life of the hidden slide rail system and the long-term smoothness of movement, and significantly improves the load-bearing stability, operational reliability and smooth feel of the entire operation of the device.

[0012] Furthermore, the sliding limit part is located below the positioning limit part; by setting the sliding limit part below the top support limit part, the swing cam is lowered to a lower position in the sliding state, forming a greater height difference with the lifting position in the retracted state, thereby creating a more sufficient disengagement gap between the swing cam and the card slot, ensuring that the support part can pass through unobstructed when the external guide rail slides out, and avoiding accidental contact or friction caused by insufficient return of the swing cam; at the same time, this high-low staggered arrangement provides a clear swing stroke range for the top support assembly, so that the swing cam moves crisply and is clearly positioned when switching between the top support limit part and the sliding limit part, which not only enhances the lifting stability when statically supporting, but also ensures the complete disengagement when dynamically sliding out, effectively improving the switching reliability and long service life of the hidden slide rail device during repeated retraction and extension.

[0013] Furthermore, when the swing cam is in the sliding limit position, the lower end of the guide is located below the upper end of the swing cam. This design ensures that the lower end of the guide is lower than the upper end of the swing cam in the sliding state, creating a vertical misalignment. This guarantees that the guide only contacts and pushes the swing cam from above during the retraction of the external guide rail, and does not interfere with or accidentally contact it when passing over it during the sliding process. This avoids gravity transfer disorder, jamming, or abnormal wear caused by the guide accidentally pushing the swing cam. Simultaneously, this misalignment design allows the swing cam to maintain a fully sunken posture at the sliding limit position, providing a reliable starting point for the guide to accurately contact the upper front of the swing cam during the next retraction action. This significantly improves the timing accuracy, smoothness of operation, and durability of the top support assembly and the support component during repeated retraction cycles.

[0014] Furthermore, when the swing cam is oscillating and limited to the position limit, the swing cam remains vertical or tilted to one side of the position limit. By setting the swing cam to be vertical or tilted to one side of the top support limit at the top support limit, the swing cam can enter the card slot at a stable angle that is close to upright or slightly tilted backward after the support is retracted into position. This allows the weight of the external guide rail to be transmitted to the top support along the axial direction or near the axial direction of the swing cam. This avoids the swing cam from generating lateral force due to the skewed force direction, which could lead to uneven force on the rotating bearing or the swing cam coming off outward. At the same time, the vertical or tilted posture to the top support limit increases the contact area and fit stability between the upper end of the swing cam and the side wall of the card slot. Even under vibration or off-center load conditions, it can maintain a reliable top support state, preventing the swing cam from accidentally swinging back and causing the weight to transfer back to the first sliding connection structure too early. This significantly improves the locking reliability, anti-disturbance ability, and structural stability during long-term use under static load conditions.

[0015] Furthermore, the top support assembly and the support member are provided in at least two sets at intervals. By providing at least two sets of top support assemblies and corresponding support members at intervals along the length of the guide rail, the static load of the external guide rail after it is retracted into place can be distributed between multiple swing cams and the support edge. This avoids local deformation, wear, or skewness of the support member due to concentrated force at a single top support point. At the same time, the multi-point support structure significantly improves the bending resistance and load uniformity of the external guide rail in the length direction. Even under eccentric load or vibration conditions, it can maintain the synchronous lifting and lowering of each swing cam, further reducing the risk of sinking caused by long-term static pressure, and effectively improving the overall rigidity, motion stability, and service life of the device in wide-span, heavy-load application scenarios.

[0016] Furthermore, the card slot is an arc-shaped groove with an inner wall arc. By setting the card slot as an arc-shaped groove with an inner wall arc, the swing cam can form an arc-shaped contact with the inner wall of the arc-shaped groove after entering the card slot. Compared with the angular groove structure, the arc-shaped groove can effectively eliminate stress concentration points and avoid local wear and extrusion deformation caused by point contact or line contact between the swing cam and the edge of the card slot. At the same time, the arc-shaped contact can still automatically center and maintain a stable surface contact state when the swing cam is slightly misaligned or there are manufacturing tolerances. This reduces the fitting accuracy requirements between the top support assembly and the support component, reduces the frictional resistance and wear during repeated opening and closing, and significantly improves the uniformity of force distribution during static top support and the reliability of long-term use.

[0017] Furthermore, it also includes an internal guide rail component. The external guide rail component has a first receiving cavity with an opening at its lower end, and the internal guide rail component has a second receiving cavity with an opening at its lower end. The internal guide rail component is placed within the first receiving cavity, and the external guide rail component slides with the internal guide rail component through a first sliding connection structure. The fixed guide portion is placed within the second receiving cavity, and the internal guide rail component slides with the fixed guide rail component through a second sliding connection structure. With this configuration, by adding an internal guide rail component and employing a nested structure with inner and outer double-layer receiving cavities, the external guide rail component and the internal guide rail component achieve a first level of relative sliding through the first sliding connection structure, and the internal guide rail component and the fixed guide rail component achieve another level of relative sliding through the second sliding connection structure. This creates a multi-stage telescopic hidden slide rail within a limited space, significantly increasing the total travel and... The telescopic ratio meets the needs of applications such as deep drawers and long-stroke sliding doors. Meanwhile, the fixed guide section is housed in the second cavity of the internal guide rail, while the first cavity of the external guide rail accommodates the internal guide rail. This allows each level of guide rail to nest and contain each other in the retracted state, resulting in a compact overall structure that completely conceals internal moving parts, further enhancing dust resistance and aesthetics. Furthermore, the top support assembly and support component remain located outside the external guide rail, without interfering with the internal multi-layer sliding structure. When retracted, they can also transfer the weight of the external guide rail from the first sliding connection structure to the swing cam, effectively protecting the rollers or sliders on the internal and fixed guide rails from long-term static loads. Thus, the multi-stage telescopic slide rail system combines the advantages of large stroke, compactness, dust resistance, aesthetics, and smooth long-term operation.

[0018] Furthermore, the first sliding connection structure includes a first sliding frame disposed between the outer guide rail and the inner guide rail. The first sliding frame has several roller grooves extending through the upper and lower sides at the top and support frames 641 on both sides. Vertical rollers rotating about a horizontal axis are disposed within the roller grooves, slidingly engaging with the upper outer guide rail and the lower inner guide rail respectively. A ball bearing frame extending inwards is disposed at the lower end of the support frame 641, with several freely rolling balls on the ball bearing frame. The inner guide rail is supported on the balls of the support frame 641 by convex rails on both sides. With this arrangement, by simultaneously providing vertical rollers rotating about a horizontal axis and balls in the ball bearing frame at the lower end of the support frame 641 on the first sliding frame, wherein the vertical rollers form rolling engagements with the upper outer guide rail and the lower inner guide rail respectively, the vertical load is borne and the load is ensured. The smoothness of the vertical relative movement, while the ball bearings on both sides support the convex rails of the internal guide rail components through the support bracket 641, undertake the functions of lateral positioning and guidance, thus realizing the separation of vertical load-bearing and lateral guidance functions. This not only avoids premature wear caused by a single rolling element bearing multi-directional loads at the same time, but also improves the resistance to static sinking by utilizing the large contact area of ​​the vertical rollers. At the same time, the structural design of the vertical rollers running through the upper and lower sides allows the first sliding frame to integrate double-sided rolling guidance within a limited height. The ball bearing frame is set at the lower end of the support bracket 641 to make full use of the lateral space. The overall structure is compact and the load distribution is reasonable. It complements the static unloading function of the top support component. During dynamic sliding, low-friction movement is achieved by relying on the vertical rollers and ball bearings. During static load-bearing, gravity is bypassed and transferred through the swing cam, thus significantly improving the comprehensive performance, service life and smoothness of the multi-stage hidden slide rail under frequent start-stop and long-term static conditions.

[0019] Furthermore, the second sliding connection structure includes a second sliding frame, which comprises an upper sliding frame, a lower sliding frame, and a side sliding frame. The upper sliding frame is disposed on the upper side of the lower sliding frame, and one side of the upper sliding frame is connected to one side of the lower sliding frame via a connecting part. The upper end of the side sliding frame is connected to the other side of the upper sliding frame, and the distance between the side sliding frame and the lower sliding frame forms a sliding clearance opening. An L-shaped sliding groove is formed between the upper sliding frame, the lower sliding frame, and the side sliding frame, and the sliding groove communicates with the outside through the sliding clearance opening. The upper sliding frame, the lower sliding frame, and the side sliding frame are each provided with a pulley groove, and a pulley is rotatably connected in the pulley groove. The second sliding frame is placed in the second accommodating cavity and slides with the inner wall of the second accommodating cavity through each pulley. The fixed guide part is L-shaped and is placed in the sliding groove and slides with each pulley. With this configuration, the second sliding frame is designed as an integral structure formed by connecting the upper sliding frame, the lower sliding frame, and the side sliding frame via a connecting part. The three components form an L-shaped sliding groove and communicate with the outside through the sliding clearance opening. The L-shaped fixed guide part is embedded in the sliding groove, and the upper sliding frame... The frame, lower slide, and side slide are each equipped with pulleys that rotate around their respective axes. This allows for multi-faceted rolling contact between the second slide and the fixed guide rail in both orthogonal directions of the L-shape, significantly improving anti-tipping capability and load-bearing rigidity, and effectively limiting the swaying or derailment of the internal guide rail during movement. Simultaneously, the complementary shapes of the L-shaped sliding groove and the L-shaped fixed guide make the overall structure compact and fully utilize the internal corner space of the second accommodating cavity. The sliding clearance ensures reliable contact between the pulley and the side wall of the fixed guide without interference. Furthermore, the pulleys distributed on the three sides jointly bear the dynamic load from the internal guide rail, forming a multi-level, distributed rolling support system in conjunction with the rollers and balls of the first sliding connection structure. When the external guide rail slides out, each sliding connection structure maintains low-friction operation, and after retraction, the overall weight can be bypassed and unloaded by the top support assembly. Thus, a unified system of large stroke, high rigidity, anti-derailment, low wear, and long-term static unloading functions is achieved in the multi-layered nested hidden slide rail.

[0020] Furthermore, the pulley groove includes a transverse pulley groove. The side slide and the lower slide are each provided with a plurality of transverse pulley grooves, which respectively penetrate the left and right sides of the side slide and the lower slide. The pulley includes a transverse pulley rotatably connected to the transverse pulley groove, and the transverse pulley rotates relative to the vertical axis. With this arrangement, by providing transverse pulley grooves penetrating the left and right sides on the side slide and the lower slide respectively, and installing transverse pulleys rotating about the vertical axis in them, the second slide can apply transverse rolling constraint to the fixed guide part in both the vertical side and the horizontal bottom surface of the L-shaped sliding groove. When the internal guide rail is subjected to eccentric load or lateral force... When subjected to force, the transverse pulley can convert sliding friction into rolling friction and effectively suppress the relative tilting and offset between the inner and outer guide rails. At the same time, the transverse pulley groove through the left and right sides facilitates the installation and maintenance of the pulley, and allows the pulley to extend to both sides to form a stable contact with the inner side wall of the second accommodating cavity or the side of the fixed guide part. Thus, without increasing the overall size of the sliding frame, the lateral bearing area and torsional stiffness are increased. Together with the pulley on the upper slide, it forms an all-round rolling guide system, which not only reduces the lateral friction resistance and wear during dynamic operation, but also ensures the linear motion accuracy and anti-shaking ability of the multi-stage telescopic slide rail during the sliding and retraction process after the static gravity is unloaded by the top support assembly.

[0021] Furthermore, the pulley groove includes a vertical pulley groove. The upper slide and the lower slide are each provided with a plurality of such vertical pulley grooves, which respectively penetrate the upper and lower sides of the upper slide and the lower slide. The pulley includes a vertical pulley rotatably connected to the vertical pulley groove, and the vertical pulley rotates relative to the horizontal axis. With this arrangement, by providing vertical pulley grooves penetrating the upper and lower sides on the upper and lower slides respectively, and installing vertical pulleys that rotate around the horizontal axis in them, the second slide can provide rolling support to the fixed guide and the inner wall of the second accommodating cavity on both the upper and lower sides of the L-shaped sliding groove in the vertical direction. The cooperation between the vertical pulley and the upper and lower slides can effectively support the internal guide rail. The vertical load on the component relative to the fixed guide rail component, along with the pulley groove design that runs through both the upper and lower sides, allows the vertical pulley to protrude appropriately to the upper and lower sides, thereby forming rolling contact with the upper surface of the fixed guide part above and the bottom surface of the second accommodating cavity below, respectively. This expands the vertical load-bearing span and avoids direct frictional contact between the sliding mating surfaces. The vertical pulley, together with the transverse pulleys on the side slide and the lower slide, forms an orthogonal rolling system, which together absorbs complex loads from different directions. This significantly reduces running resistance during dynamic sliding and helps maintain the centering posture of the guide rail during static unloading, thereby further improving the load uniformity, movement stability, and long-term smoothness and reliability of the multi-stage hidden slide rail device.

[0022] Furthermore, the first sliding frame has a first gear groove along its length on one side, and the upper sliding frame has a second gear groove along its length on one side. The internal guide rail has a transmission gear that rotates relative to the other side around a transverse axis. The upper side of the transmission gear meshes with the first gear groove, and the transmission gear meshes with the second gear groove. With this arrangement, by providing the first and second gear grooves along their lengths on the first and upper sliding frames respectively, and installing the transmission gear on the internal guide rail that meshes with both, when the outer guide rail slides out or retracts relative to the inner guide rail, the first sliding frame drives the transmission gear to rotate via the first gear groove. The transmission gear then drives the upper sliding frame and the internal guide rail via the second gear groove. The components move synchronously, thus achieving synchronized extension and retraction between the external guide rail components, the first sliding frame, the transmission gear, and the internal guide rail components. This effectively avoids jamming, misalignment, or impact caused by asynchronous strokes at each stage of the multi-stage slide rail during movement. At the same time, compared with the method of simply relying on friction or limit blocks, the gear and rack meshing transmission has higher transmission accuracy and motion consistency, making the timing coordination between the top support assembly and the support component more precise and reliable during the extension and retraction process. Furthermore, the intervention of the transmission gear shares some of the guiding and positioning functions, reducing the lateral load on the rolling elements in the first and second sliding connection structures, and further improving the synchronization, smoothness, and service life of the multi-stage hidden slide rail in frequent reciprocating motion. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a hidden slide rail device.

[0024] Figure 2 This is a schematic diagram showing the external guide rail of the concealed slide rail device in its retracted state.

[0025] Figure 3 The external guide rail of the concealed slide rail device is prepared to slide out relative to the other side in the retracted state. Schematic diagram of the activated state.

[0026] Figure 4 This is a schematic diagram showing the external guide rail of the concealed slide rail device in a relatively slid-out state.

[0027] Figure 5 An exploded view to conceal the sliding rail mechanism.

[0028] Figure 6 This is a schematic diagram of the first sliding connection structure.

[0029] Figure 7 Schematic diagram of the second sliding connection structure Figure 1 .

[0030] Figure 8 Schematic diagram of the second sliding connection structure Figure 2 .

[0031] Figure 9 This is a schematic diagram of the internal guide rail components.

[0032] Figure 10 Side view of the hidden slide rail device.

[0033] Labeling: Fixed guide rail 1, External guide rail 2, Internal guide rail 3, Top support assembly 4, Support 5, Support edge 11, Fixed guide part 12, First sliding connection structure 6, Top support seat 41, Swinging cam 42, Swinging movable cavity 43, Top support part 44, Slide-out limiting part 45, Top support limiting part 46, Card slot 51, Guide part 52, First receiving cavity 20, Second receiving cavity 30, First sliding frame 61, Roller groove 62, Vertical roller 63, Ball bearing Frame 64, ball bearing 65, second sliding frame 71, upper sliding frame 72, lower sliding frame 73, side sliding frame 74, sliding clearance opening 75, sliding groove 76, transverse pulley groove 77, transverse pulley 771, vertical pulley groove 78, vertical pulley 781, first gear groove 81, second gear groove 82, transmission gear 83, first limiting member 91, second limiting member 92, third limiting member 93, fourth limiting member 94, second sliding connection structure 7, support frame 641. Detailed Implementation

[0034] The specific embodiments of the present invention are described below with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and are not intended to 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, they should not be construed as limitations on the present invention.

[0035] See Figures 1 to 10 The concealed slide rail device of the present invention includes a fixed guide rail 1, an external guide rail 2, a top support assembly 4, and a support 5.

[0036] The fixed guide rail 1 has a support edge 11 extending along the inner side and a fixed guide part 12 located at the inner end of the support edge 11.

[0037] An external guide rail 2 is provided with a first sliding connection structure 6 between the external guide rail 2 and the fixed guide rail 1. The external guide rail 2 is guided by the sliding connection structure 6 and can slide out or retract relative to the external guide rail 2.

[0038] The top support assembly 4 is disposed on the support edge 11 outside the outer guide rail 2, and includes a top support seat 41 and a swing cam 42. The top support seat 41 has a swing movable cavity 43 with an upper opening. The lower part of the swing cam 42 is rotatably connected to the swing movable cavity 43 and can swing relative to the sliding direction of the outer guide rail 2. The upper part of the swing cam 42 extends out of the swing movable cavity 43 to form a top support part 44. The top support seat 41 is provided with a sliding limit part 45 on the side of the swing cam 42 along the sliding direction of the outer guide rail 2, and a top support limit part 46 on the side of the swing cam 42 along the retraction direction of the outer guide rail 2. The swing cam 42 swings between the sliding limit part 45 and the retraction limit part. The top support limit part 46 is used to keep the swing cam 42 in a raised state, and the sliding limit part 45 is used to lower the swing cam 42.

[0039] The support member 5 is disposed on the outside of the outer guide rail member 2. It has a card slot 51 with an opening at the lower end and a guide member 52 located on the side of the card slot 51 along the sliding direction of the outer guide rail member 2. The guide member 52 extends out of the lower side of the support member 5. The guide member 52 and the lower end of the side of the card slot 51 are smoothly connected. The guide member 52 is used to drive the swing cam 42 to swing and enter the card slot 51 when the outer guide rail member 2 is retracted. When the swing cam 42 swings to the top support limit part 46, it supports the outer guide rail member 2, so that the weight supported by the outer guide rail member 2 is transferred from the first sliding connection structure 6 to the swing cam 42. When the outer guide rail member 2 slides out, the support member 5 drives the swing cam 42 to swing synchronously, so that the swing cam 42 swings downward and is limited to the sliding limit part 45 and disengages from the card slot 51, so that the weight supported by the outer guide rail member 2 is transferred from the swing cam 42 to the first sliding connection structure 6 to continue sliding outward.

[0040] Compared with the prior art, the concealed slide rail device of the present invention, through the cooperation of the top support assembly 4 and the support member 5, allows the guide member 52 on the support member 5 to accurately guide the swing cam 42 to swing and enter the card slot 51 when the external guide rail 2 is retracted. When the swing cam 42 swings to the top support limiting part 46, it is limited to the lifting state, thereby transferring the external guide rail 2 and its load from the first sliding connection structure 6 to the top support assembly 4. This prevents the moving parts such as the first sliding connection structure 6 from being compressed under long-term static load, effectively avoiding sinking, creep, wear caused by static load, as well as the resulting increase in motion resistance and noise. The smoothness decreases; when the external guide rail 2 slides out relative to the external guide rail 2, the support 5 directly drives the swing cam 42 to swing in the opposite direction and limit it to the sliding limit part 45, so that the swing cam 42 drops and disengages from the card slot 51, and the gravity is transferred back to the first sliding connection structure 6, ensuring low friction performance during dynamic operation. The entire mechanism realizes the time-sharing switching between static load and dynamic movement in the narrow space of the hidden slide rail, without increasing the roller diameter, increasing the number of rollers or relying on frequent lubrication. It fundamentally solves the contradiction between the service life of the hidden slide rail system and the long-term smoothness of movement, and significantly improves the load stability, operational reliability and smooth feel of the device throughout the operation.

[0041] See Figures 2 to 10 In one embodiment, the sliding limit part 45 is located below the positioning limit part. By setting the sliding limit part 45 below the top support limit part 46, the swing cam 42 is lowered to a lower position in the sliding state, forming a greater height difference with the lifting position in the retracted state. This creates a more sufficient disengagement gap between the swing cam 42 and the card slot 51, ensuring that the support part 5 can pass through unobstructed when the external guide rail 2 slides out, avoiding accidental contact or friction caused by insufficient return of the swing cam 42. At the same time, this staggered arrangement provides a clear swing stroke range for the top support assembly 4, making the swing cam 42 move crisply and position clearly when switching between the top support limit part 46 and the sliding limit part 45. This not only enhances the lifting stability when statically supporting the top, but also ensures the complete disengagement when dynamically sliding out, effectively improving the switching reliability and long service life of the hidden slide rail device during repeated retraction and extension.

[0042] See Figures 2 to 10In one embodiment, when the swing cam 42 is swung to the limit of the slide-out limit 45, the lower end of the guide member 52 is located below the upper end of the swing cam 42. This configuration ensures that the lower end of the guide member 52 is lower than the upper end of the swing cam 42 in the slide-out state, creating a vertical misalignment. This ensures that the guide member 52 only contacts and pushes the swing cam 42 from above during the retraction of the external guide rail 2. During the slide-out process, the guide member 52 does not interfere with or accidentally contact the swing cam 42 when passing over it. This avoids gravity transfer disorder, jamming, or abnormal wear caused by the guide member 52 mistakenly pushing the swing cam 42. Simultaneously, this misalignment design allows the swing cam 42 to maintain a fully sunken posture at the slide-out limit 45, providing a reliable starting point for the guide member 52 to accurately contact the upper front of the swing cam 42 during the next retraction action. This significantly improves the timing accuracy, smoothness of operation, and durability of the top support assembly 4 and the support member 5 in repeated retraction cycles.

[0043] See Figures 2 to 10 In one embodiment, when the swing cam 42 is swing-limited to the positioning limit, the swing cam 42 remains vertical or tilted towards the positioning limit. By setting the swing cam 42 to a vertical or tilted towards the positioning limit at the top support limit 46, after the support member 5 is retracted to its final position, the swing cam 42 can enter the card slot 51 at a stable angle that is nearly upright or slightly tilted backward. This transfers the weight of the external guide rail 2 along the axial direction or near the axial direction of the swing cam 42 to the top support 41, preventing… The lateral force generated by the slanted force direction of the swing cam 42 causes uneven force on the rotating bearing or the swing cam 42 to disengage outward. At the same time, the vertical or tilted posture towards the top support limit part 46 also increases the contact area and fit stability between the upper end of the swing cam 42 and the side wall of the card slot 51. Even under vibration or off-center load conditions, it can maintain a reliable top support state, preventing the swing cam 42 from accidentally swinging back and causing the gravity to transfer back to the first sliding connection structure 6 too early. This significantly improves the locking reliability, anti-disturbance ability and structural stability during long-term use under static load.

[0044] See Figures 2 to 10In one embodiment, the top support assembly 4 and the support member 5 are provided in at least two sets spaced apart. By providing at least two sets of top support assemblies 4 and corresponding support members 5 spaced apart along the length of the guide rail, the static load of the external guide rail 2 after it is retracted into place can be distributed between multiple swing cams 42 and the support edge 11, avoiding local deformation, wear, or skewness of the support member 5 due to concentrated force at a single top support point. At the same time, the multi-point support structure significantly improves the bending resistance and load uniformity of the external guide rail 2 in the length direction. Even under off-center load or vibration conditions, it can maintain the synchronous lifting and lowering of each swing cam 42. In one embodiment, it reduces the risk of sinking caused by long-term static pressure and effectively improves the overall rigidity, motion stability, and service life of the device in wide-span, heavy-load application scenarios.

[0045] See Figures 2 to 10 In one embodiment, the card slot 51 is an arc-shaped groove with an inner wall arc. By setting the card slot 51 as an arc-shaped groove with an inner wall arc, the swing cam 42 can form an arc-shaped contact with the inner wall of the arc-shaped groove after entering the card slot 51. Compared with the angular groove structure, the arc-shaped groove can effectively eliminate stress concentration points and avoid local wear and extrusion deformation caused by point contact or line contact between the swing cam 42 and the edge of the card slot 51. At the same time, the arc-shaped contact can still automatically center and maintain a stable surface contact state when the swing cam 42 is slightly misaligned or there are manufacturing tolerances. This reduces the fitting accuracy requirements between the top support assembly 4 and the support member 5, reduces the frictional resistance and wear during repeated opening and closing, and significantly improves the uniformity of force during static top support and the reliability of long-term use.

[0046] See Figures 2 to 10In one embodiment, an internal guide rail 3 is further included. The external guide rail 2 has a first receiving cavity 20 with an opening at its lower end, and the internal guide rail 3 has a second receiving cavity 30 with an opening at its lower end. The internal guide rail 3 is placed within the first receiving cavity 20, and the external guide rail 2 is slidably engaged with the internal guide rail 3 through a first sliding connection structure 6. The fixed guide part 12 is placed within the second receiving cavity 30, and the internal guide rail 3 is slidably engaged with the fixed guide rail 1 through a second sliding connection structure 7. With this arrangement, by adding the internal guide rail 3 and adopting a nested structure of inner and outer double-layer receiving cavities, the external guide rail 2 and the internal guide rail 3 achieve a first level of relative sliding through the first sliding connection structure 6, and the internal guide rail 3 and the fixed guide rail 1 achieve another level of relative sliding through the second sliding connection structure 7. This constitutes a multi-level telescopic hidden slide rail within a limited space, significantly increasing the efficiency. The total stroke and telescopic ratio meet the needs of applications such as deep drawers and long-stroke sliding doors. At the same time, the fixed guide part 12 is accommodated in the second receiving cavity 30 of the inner guide rail 3, and the first receiving cavity 20 of the outer guide rail 2 accommodates the inner guide rail 3, so that each level of guide rail is nested and contained in the retracted state. The overall structure is compact and completely hides the internal moving parts, which improves dust protection and aesthetics in one embodiment. In addition, the top support assembly 4 and the support 5 are still located on the outside of the outer guide rail 2, without interfering with the internal multi-layer sliding structure. When retracted to the position, they can also transfer the weight of the outer guide rail 2 and its load from the first sliding connection structure 6 to the swing cam 42, effectively protecting the rollers or sliders on the inner guide rail 3 and the fixed guide rail 1 from long-term static load. Thus, the multi-level telescopic slide rail system takes into account the multiple advantages of large stroke, compactness, dust protection and aesthetics, and long-term smooth operation.

[0047] See Figures 2 to 10In one embodiment, the first sliding connection structure 6 includes a first sliding frame 61 disposed between the outer guide rail 2 and the inner guide rail 3. The first sliding frame 61 is provided with a plurality of roller grooves 62 located at the top and extending through the upper and lower sides, and support frames 641 located on both sides. The roller grooves 62 are provided with vertical rollers 63 that rotate around the horizontal axis, and slide in cooperation with the outer guide rail 2 located on the upper side and the inner guide rail 3 located on the lower side, respectively. The lower end of the support frame 641 is provided with an inner side... A ball bearing cage 64 extends in a certain direction, and a plurality of freely rolling balls 65 are provided on the ball bearing cage 64. The internal guide rail 3 is supported on the balls 65 of the support frame 641 by the convex rails on both sides. With this arrangement, vertical rollers 63 that rotate about the transverse axis and balls 65 located in the ball bearing cage 64 at the lower end of the support frame 641 are simultaneously provided on the first sliding frame 61. The vertical rollers 63 form rolling engagement with the upper external guide rail 2 and the lower internal guide rail 3 respectively, supporting... The vertical roller 63 bears the vertical load and ensures smooth vertical relative movement. The ball bearings 65 on both sides support the convex rails of the internal guide rail 3 through the support frame 641, undertaking the functions of lateral positioning and guidance. This achieves the separation of vertical load bearing and lateral guidance functions, which not only avoids premature wear caused by a single rolling element bearing multi-directional loads at the same time, but also improves the resistance to static sinking by utilizing the large contact area of ​​the vertical roller 63. At the same time, the structural design of the vertical roller 63 running through the upper and lower sides allows the first sliding frame 61 to integrate double-sided rolling guidance within a limited height. The ball bearing frame 64 is set at the lower end of the support frame 641 to make full use of the lateral space. The overall structure is compact and the load distribution is reasonable. It complements the static unloading function of the top support assembly 4. During dynamic sliding, low-friction movement is achieved by relying on the vertical roller 63 and the ball bearings 65. During static load bearing, the gravity is transferred by the swing cam 42, which significantly improves the comprehensive performance, service life and smoothness of the multi-stage hidden slide rail under frequent start-stop and long-term static conditions.

[0048] See Figures 2 to 10In one embodiment, the second sliding connection structure 7 includes a second sliding frame 71, which includes an upper sliding frame 72, a lower sliding frame 73, and a side sliding frame 74. The upper sliding frame 72 is disposed on the upper side of the lower sliding frame 73, and one side of the upper sliding frame 72 is connected to one side of the lower sliding frame 73 through a connecting part. The upper end of the side sliding frame 74 is connected to the other side of the upper sliding frame 72. The distance between the side sliding frame 74 and the lower sliding frame 73 forms a sliding clearance opening 75. An L-shaped sliding groove 76 is formed between the upper sliding frame 72, the lower sliding frame 73, and the side sliding frame 74. The sliding groove 76 communicates with the outside through the sliding clearance opening 75. The upper slide 72, lower slide 73, and side slide 74 are each provided with pulley grooves, and pulleys are rotatably connected in the pulley grooves. The second slide 71 is placed in the second accommodating cavity 30 and slides against the inner wall of the second accommodating cavity 30 through each pulley. The fixed guide part 12 is L-shaped and is placed in the sliding groove 76 and slides against each pulley. With this arrangement, the second slide 71 is designed as an integral structure formed by connecting the upper slide 72, lower slide 73, and side slide 74 through a connecting part. The three parts form an L-shaped sliding groove 76 and communicate with the outside through a sliding clearance opening 75. With the L-shaped fixed guide portion 12 embedded in the sliding groove 76, and pulleys rotating around corresponding axes respectively provided on the upper slide 72, lower slide 73, and side slide 74, multi-faceted rolling contact is achieved between the second sliding frame 71 and the fixed guide rail 1 in both orthogonal directions of the L-shape. This significantly improves the anti-rollover capability and load-bearing rigidity, effectively limiting the swaying or derailment of the internal guide rail 3 during movement. Simultaneously, the complementary shapes of the L-shaped sliding groove 76 and the L-shaped fixed guide portion 12 result in a compact overall structure that fully utilizes the internal corner space of the second accommodating cavity 30, facilitating sliding... The clearance 75 ensures reliable contact between the pulley and the side wall of the fixed guide 12 without interference. In addition, the pulleys distributed on the three sides jointly bear the dynamic load from the internal guide rail 3. Together with the rollers and balls 65 of the first sliding connection structure 6, they form a multi-level distributed rolling support system. When the external guide rail 2 slides out, each sliding connection structure maintains low friction operation. After it is returned to the position, the overall gravity can also be bypassed and unloaded by the top support assembly 4. Thus, the organic unity of large stroke, high rigidity, anti-derailment, low wear and long-term static unloading functions is achieved in the multi-layer nested hidden slide rail.

[0049] See Figures 2 to 10In one embodiment, the pulley groove includes a transverse pulley groove 77. The side slide 74 and the lower slide 73 are respectively provided with a plurality of transverse pulley grooves 77, which respectively pass through the left and right sides of the side slide 74 and the lower slide 73. The pulley includes a transverse pulley 771 rotatably connected to the transverse pulley groove 77, and the transverse pulley 771 rotates relative to each other about the vertical axis. With this arrangement, by providing transverse pulley grooves 77 that pass through the left and right sides on the side slide 74 and the lower slide 73 respectively, and installing transverse pulleys 771 that rotate about the vertical axis in them, the second slide 71 can apply transverse rolling constraint to the fixed guide part 12 in both the vertical side and the horizontal bottom surface of the L-shaped sliding groove 76. When the internal guide rail 3 is subjected to eccentric load or lateral force, the transverse pulley 771 can convert sliding friction into rolling friction and effectively suppress the relative tilt and offset between the inner and outer guide rails. At the same time, the transverse pulley groove 77, which runs through both sides, facilitates the installation and maintenance of the pulley and allows the pulley to extend to both sides to form a stable contact with the inner wall of the second accommodating cavity 30 or the side of the fixed guide part 12. This increases the lateral bearing area and torsional stiffness without increasing the overall size of the sliding frame. Together with the pulley on the upper slide 72, it forms an all-round rolling guide system, which reduces the lateral friction resistance and wear during dynamic operation and ensures the linear motion accuracy and anti-shaking ability of the multi-stage telescopic slide rail during the sliding and retraction process after the top support assembly 4 unloads the static gravity.

[0050] See Figures 2 to 10In one embodiment, the pulley groove includes a vertical pulley groove 78. The upper slide 72 and the lower slide 73 are respectively provided with a plurality of the vertical pulley grooves 78, which respectively penetrate the upper and lower sides of the upper slide 72 and the lower slide 73. The pulley includes a vertical pulley 781 rotatably connected to the vertical pulley groove 78, and the vertical pulley 781 rotates relative to the horizontal axis. With this arrangement, by providing vertical pulley grooves 78 penetrating the upper and lower sides on the upper slide 72 and the lower slide 73 respectively, and installing vertical pulleys 781 rotating about the horizontal axis in them, the second slide 71 can provide rolling support to the inner wall of the fixed guide part 12 and the second accommodating cavity 30 on both the upper and lower sides of the L-shaped sliding groove 76 in the vertical direction. The vertical pulley 781 and the upper slide 72 and the lower slide 73 are respectively provided with a plurality of the vertical pulley grooves 78. The cooperation of the internal guide rail 3 can effectively bear the vertical load of the internal guide rail 3 relative to the fixed guide rail 1. At the same time, the pulley groove design that runs through the upper and lower sides allows the vertical pulley 781 to protrude appropriately to the upper and lower sides, so as to form rolling contact with the upper surface of the upper fixed guide part 12 and the bottom surface of the lower second accommodating cavity 30 respectively. This not only expands the vertical load-bearing span, but also avoids direct frictional contact between the sliding mating surfaces. The vertical pulley 781, together with the transverse pulley 771 on the side slide 74 and the lower slide 73, forms an orthogonal rolling system, which together absorbs complex loads from different directions. During dynamic sliding, it significantly reduces running resistance, and during static unloading, it helps to maintain the centering posture of the guide rail. Thus, in one embodiment, it improves the load uniformity, movement stability, and long-term smoothness and reliability of the multi-stage hidden slide rail device.

[0051] See Figures 2 to 10In one embodiment, the first sliding frame 61 has a first gear groove 81 along its length on one side, and the upper sliding frame 72 has a second gear groove 82 along its length on one side. The inner guide rail 3 has a transmission gear 83 that rotates relative to each other around a transverse axis. The upper side of the transmission gear 83 meshes with the first gear groove 81, and the transmission gear 83 meshes with the second gear groove 82. With this arrangement, by providing the first gear groove 81 and the second gear groove 82 along their lengths on the first sliding frame 61 and the upper sliding frame 72 respectively, and installing the transmission gear on the inner guide rail 3 that meshes with both, when the outer guide rail 2 slides out or retracts relative to the inner guide rail 3, the first sliding frame 61 drives the transmission gear to rotate through the first gear groove 81, and the transmission gear then rotates through the second gear groove 82. 2 drives the upper slide 72 and the internal guide rail 3 to move synchronously, thereby realizing the linkage and synchronous extension and retraction between the external guide rail 2, the first slide 61, the transmission gear 83 and the internal guide rail 3. This effectively avoids jamming, misalignment or impact caused by asynchronous stroke of each stage of the multi-stage slide rail during movement. At the same time, the gear and rack meshing transmission has higher transmission accuracy and motion consistency than the method of simply relying on friction or limit block pushing. This makes the timing coordination between the top support assembly 4 and the support 5 more precise and reliable during the extension and retraction process. In addition, the intervention of the transmission gear shares some of the guiding and positioning functions, reducing the lateral load on the rolling elements in the first sliding connection structure 6 and the second sliding connection structure 7. In one embodiment, this improves the synchronization, smoothness and service life of the multi-stage hidden slide rail in frequent reciprocating motion.

[0052] See Figures 2 to 10 In one embodiment, the external guide rail 2 is provided with a first limiting member 91 at both ends to limit the first sliding frame 61 from disengaging from the first receiving cavity 20, the internal guide rail 3 is provided with a second limiting member 92 at one end to limit the first sliding frame 61 from disengaging longitudinally, the internal guide rail 3 is provided with a third limiting member 93 at the other end to limit the second sliding frame 71 from disengaging from the second receiving cavity 30, and the fixed guide part 12 is provided with a fourth limiting member 94 at both ends to limit the second sliding frame 71 from disengaging longitudinally.

[0053] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. 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 the present invention.

Claims

1. A concealed slide rail device, characterized in that, include: The fixed guide rail component has a support edge extending along the inner side and a fixed guide portion located at the inner end of the support edge; An external guide rail component is provided with a first sliding connection structure between the external guide rail component and the fixed guide rail component. The external guide rail component is slidably guided by the first sliding connection structure and can slide out or retract relative to the external guide rail component. A top support assembly, located on the outer side of the outer guide rail on the support edge, includes a top support seat and a swing cam. The top support seat has a swing movable cavity with an upper opening. The lower part of the swing cam is rotatably connected to the swing movable cavity and can swing relative to the sliding direction of the outer guide rail. The upper part of the swing cam extends out of the swing movable cavity to form a top support part. The top support seat has a sliding limit part on the side of the swing cam along the sliding direction of the outer guide rail and a top support limit part on the side of the swing cam along the retraction direction of the outer guide rail. The swing cam swings between the sliding limit part and the retraction limit part. The top support limit part is used to keep the swing cam in a raised state, and the sliding limit part is used to lower the swing cam. The support member is located on the outside of the outer guide rail and has a card slot with an opening at the lower end and a guide member located on the side of the card slot along the sliding direction of the outer guide rail. The guide member extends out of the lower side of the support member and smoothly transitions with the lower end of the side of the card slot. The guide member is used to drive the swing cam to swing and enter the card slot when the outer guide rail is retracted. When the swing cam swings to the top support limit part, it supports the outer guide rail and transfers the weight supported by the outer guide rail from the first sliding connection structure to the swing cam. When the outer guide rail slides out, the support member drives the swing cam to swing synchronously, so that the swing cam swings downward and is limited to the sliding limit part and disengages from the card slot, thereby transferring the weight supported by the outer guide rail from the swing cam to the first sliding connection structure to continue sliding outward.

2. The concealed slide rail device according to claim 1, characterized in that, The sliding limit part is located below the positioning limit part; When the swing cam is oscillating and limited, the lower end of the guide member is located below the upper end of the swing cam.

3. The concealed slide rail device according to claim 1, characterized in that, When the swing cam swings to the limit position, the swing cam remains vertical or tilts to one side of the limit position.

4. The concealed slide rail device according to claim 1, characterized in that, The top support assembly and the support member are provided in at least two sets at intervals; The card slot is an arc-shaped groove with an inner wall arc.

5. The concealed slide rail device according to claim 1, characterized in that, It also includes an internal guide rail component, the external guide rail component has a first receiving cavity with an opening at the lower end, the internal guide rail component has a second receiving cavity with an opening at the lower end, the internal guide rail component is placed in the first receiving cavity, and the external guide rail component slides in cooperation with the internal guide rail component through a first sliding connection structure; The fixed guide part is placed in the second accommodating cavity, and the internal guide rail is slidably engaged with the fixed guide rail through the second sliding connection structure.

6. The concealed slide rail device according to claim 5, characterized in that, The first sliding connection structure includes a first sliding frame disposed between the outer guide rail and the inner guide rail. The first sliding frame is provided with a plurality of roller grooves extending through the upper and lower sides at the top and support frames 641 on both sides. The roller grooves are provided with vertical rollers that rotate around the horizontal axis and slide in cooperation with the outer guide rail on the upper side and the inner guide rail on the lower side, respectively. The lower end of the support frame 641 is provided with a ball bearing frame extending inward, and the ball bearing frame is provided with a plurality of freely rolling balls. The inner guide rail is supported on the balls of the support frame 641 by the convex rails on both sides.

7. The concealed slide rail device according to claim 6, characterized in that, The second sliding connection structure includes a second sliding frame, which includes an upper sliding frame, a lower sliding frame, and a side sliding frame. The upper sliding frame is disposed on the upper side of the lower sliding frame, and one side of the upper sliding frame is connected to one side of the lower sliding frame through a connecting part. The upper end of the side sliding frame is connected to the other side of the upper sliding frame. The distance between the side sliding frame and the lower sliding frame forms a sliding clearance opening. An L-shaped sliding groove is formed between the upper sliding frame, the lower sliding frame, and the side sliding frame. The sliding groove communicates with the outside through the sliding clearance opening. The upper sliding frame, the lower sliding frame, and the side sliding frame are each provided with a pulley groove, and a pulley is rotatably connected in the pulley groove. The second sliding frame is placed inside the second accommodating cavity and slides with the inner wall of the second accommodating cavity through each pulley. The fixed guide part is L-shaped and is placed in the sliding groove and slides with each pulley.

8. The concealed slide rail device according to claim 7, characterized in that, The pulley groove includes a transverse pulley groove. The side slide and the lower slide are respectively provided with a plurality of transverse pulley grooves. The plurality of transverse pulley grooves pass through the left and right sides of the side slide and the lower slide respectively. The pulley includes a transverse pulley rotatably connected to the transverse pulley groove. The transverse pulley rotates relative to the vertical axis.

9. The concealed slide rail device according to claim 7, characterized in that, The pulley groove includes a vertical pulley groove. The upper slide and the lower slide are respectively provided with a plurality of the vertical pulley grooves. The plurality of vertical pulley grooves pass through the upper and lower sides of the upper slide and the lower slide respectively. The pulley includes a vertical pulley rotatably connected to the vertical pulley groove. The vertical pulley rotates relative to the horizontal axis.

10. The concealed slide rail device according to claim 7, characterized in that, The first sliding frame has a first gear groove on one side that is arranged along the length direction, and the upper sliding frame has a second gear groove on one side that is arranged along the length direction. The internal guide rail has a transmission gear that rotates relative to each other around the transverse axis. The upper side of the transmission gear meshes with the first gear groove, and the transmission gear meshes with the second gear groove.

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