Three-section hidden sliding rail with external buffer damper

Abstract

The invention discloses a three-section hidden sliding rail with an external buffer damper. The three-section hidden sliding rail comprises an upper rail, a middle rail, a lower rail and an external buffer module. The module shell is fixed to the upper rail, and a sliding groove, a sliding block in sliding fit with the sliding groove, a driving block, an elastic piece and a damping piece are arranged in the module shell. And the lower rail is provided with a connecting piece matched with the bayonet of the sliding block. The sliding groove is composed of a horizontal section and a locking section forming an included angle with the horizontal section. In the working process, the drawer is opened, the connecting piece drives the sliding block to slide on the horizontal section and store energy, then the sliding block slides into the locking section to be fixed, the bayonet turns and is separated from the connecting piece, and the buffering function is relieved; and when closing to the tail section, the connecting piece is clamped into the bayonet again, the elastic piece and the damping piece are triggered to work, and self-closing and buffering are achieved. According to the sliding rail, the sliding rail body can be conveniently and rapidly installed without being changed, and the excellent tail section buffering and silencing effect is provided while daily opening and closing smoothness is guaranteed.

Description

Technical Field

[0001] This application relates to the field of home hardware technology, and in particular to a three-section concealed slide rail with an external damper. Background Technology

[0002] Three-section concealed synchronous drawer slides are widely used in mid-to-high-end furniture due to their high load-bearing capacity, smooth sliding, and complete concealment within the drawer side panel. These slides typically achieve synchronized extension and retraction of the three sections through a gear and rack meshing structure between the upper, middle, and lower rails, ensuring smooth drawer opening and closing.

[0003] However, existing three-section concealed drawer slides still have functional shortcomings. Most products lack an automatic soft-close function, requiring users to manually push the drawer all the way down to close it; otherwise, the drawer may not close completely or may produce a knocking noise due to inertia. Although some drawer slides on the market integrate soft-close mechanisms, they are usually complex in structure, requiring significant modifications to the main slide structure, resulting in low integration, inconvenient installation, and high cost. Furthermore, these soft-close functions often extend throughout the entire closing stroke, causing users to experience noticeable resistance at the initial stage of closing the drawer, affecting the user experience. Therefore, there is an urgent need for a device that can be easily added to existing three-section drawer slides and provides a gentle soft-close and self-closing force only at the final stage of closing. Summary of the Invention

[0004] Based on this, the purpose of this application is to provide a three-section concealed slide rail with an external buffer damper.

[0005] This application provides a three-section concealed slide rail with an external buffer damper, including an upper rail, a middle rail, and a lower rail. The upper rail, middle rail, and lower rail slide synchronously through the meshing of gears and racks. It also includes: A housing fixed to the upper rail, the length extension direction of the housing is consistent with the extension and retraction direction of the slide rail; a sliding groove is provided inside the housing along its length direction; A lower rail connector is fixed to the lower rail and extends to correspond to the housing. A slider is slidably engaged with the groove, and the slider is provided with a slot for accommodating the lower rail connector; An elastic element and a damping element are disposed inside the housing along the extension direction of the slide groove and located at the front end of the slide groove in the opening direction of the slide rail. The movable ends of the two elements are connected to a driving block. The driving block is movably connected to the slider and can move linearly along the slide groove with the slider. The slide includes a horizontal section and a locking section communicating with the end of the horizontal section; the extending direction of the locking section forms an angle with the extending direction of the horizontal section, and its configuration is such that when the slider moves into the locking section, the slider is limited to a fixed displacement position by the groove wall of the locking section, and the opening direction of the bayonet changes accordingly, thereby enabling the lower rail connector to disengage from the bayonet.

[0006] Furthermore, the housing is fixed to the side or bottom of the upper rail by a riveting structure.

[0007] Furthermore, the riveting structure includes a rivet nut disposed on the upper rail and a fastener that cooperates with the rivet nut, and the housing is locked and fixed by the fastener.

[0008] Furthermore, the drive block and the slider are rotatably connected by a rotating shaft structure, and the end of the rotating shaft structure forms a protrusion that extends into the groove.

[0009] Furthermore, the slider's latch has an inclined guide surface on the side facing the closing direction of the slide rail.

[0010] Furthermore, the lower rail connector is a round protrusion; an upwardly bent fixing plate is fixed on the lower rail, and the round protrusion is disposed on the bent part of the fixing plate.

[0011] Furthermore, the locking segment extends upward from the end of the horizontal segment and offsets in the direction of slide rail opening.

[0012] Furthermore, the length of the horizontal segment is less than the total travel length of the upper rail relative to the lower rail.

[0013] Furthermore, the housing includes a base and a cover plate; The base has an integrally formed first part and a second part, the first part being used to accommodate the elastic element and the damping element, and the thickness of the second part being less than that of the first part; The cover plate is detachably fixed to the second part of the base, and the inner side of the cover plate and the inner side of the second part together form the two opposing groove walls of the slide. When the cover plate is installed on the base, the outer surface of the cover plate is flush with the outer surface of the first part; At the junction of the first part and the second part of the base, a first limiting part is provided for axially limiting the damping component body; The inner side of the cover plate is provided with a second limiting part for axially limiting the damping component body; The first limiting part and the second limiting part cooperate to define the position of the damping element body in the axial direction, while allowing its drive rod to extend into the second part and connect with the drive block.

[0014] The three-section concealed drawer slide with external damping provided in this application achieves its damping function by fixing an independent damping module, including a slide groove, slider, drive block, elastic element, and damping element, to the upper rail. Utilizing the cooperation between the connector fixed to the lower rail and the latch on the slider, combined with a slide groove locking section design with a specific angle, the damping function is intelligently triggered only at the end of the drawer's closing stroke. This design allows the drawer slide to move smoothly and without obstruction for most of its opening and closing stroke, only receiving a gentle self-closing force from the elastic element and uniform damping from the damping element when finally closing. This effectively solves the problem of premature resistance intervention and reduced feel in traditional damped drawer slides, achieving the ideal effect of "easy opening and quiet, smooth closing."

[0015] The further optimization of this application also brings several beneficial effects: the use of a riveting structure enables a firm and convenient installation between the buffer module and the slide rail; the design of rotating connections ensures the reliability of the internal motion mechanism; the optimized bayonet guide surface and lower rail connector structure make the trigger engagement smoother and more precise; the limitation of the buffer stroke and locking section direction further optimizes the user experience and functional stability; and the modular shell design facilitates production assembly and maintenance.

[0016] To better understand and implement this application, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall structure of the three-section concealed slide rail and external buffer damper provided in the embodiment of this application (slide rail closed state).

[0018] Figure 2 This is a schematic diagram showing the interaction between the external buffer damper and the upper and lower rail connectors in an embodiment of this application.

[0019] Figure 3 This is a three-dimensional structural diagram of the external buffer damper in the embodiment of this application (the cover plate has been installed).

[0020] Figure 4 This is a schematic diagram of the internal structure of the external buffer damper after the cover plate is removed in the embodiment of this application.

[0021] Figure 5 This is a schematic diagram showing the state of the internal slider of the external buffer damper entering the locking section in an embodiment of this application.

[0022] Figure 6This is a schematic diagram of the overall structure of the three-section concealed slide rail and external buffer damper provided in the embodiment of this application (slide rail fully extended).

[0023] Reference numerals: 100, upper rail; 200, middle rail; 300, lower rail; 310, lower rail connector; 311, fixing plate; 900, housing; 901, base; 9011, first part; 9012, second part; 902, cover plate; 905, first limiting part; 910, elastic element; 920, damping element; 930, driving block; 940, slider; 941, bayonet; 9411, guide surface; 950, slide groove; 951, horizontal section; 952, locking section; 970, rivet nut; 980, fastener. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] It should be understood that in the description of this application, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. That is, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, unless otherwise stated, "a plurality of" means two or more.

[0026] It should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "set up," "connected," "linked," and "hollow" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] In existing technologies, three-section concealed drawer slides lack a simple, easy-to-install, and non-invasive end-stage soft-close solution. When closing the drawer, users either need to push it all the way down to avoid bumps and noise, or they need to purchase and install complex soft-close components, resulting in a poor user experience and high costs.

[0028] This application addresses the technical problem of existing three-section drawer slides lacking convenient and independent final-stage buffering and self-closing functions by adding an independent buffering and damping module external to the drawer slide system. The core concept of this module is to fix it to the upper rail that moves with the drawer, and to place a trigger (lower rail connector) on the fixed lower rail. Through a special groove design inside the module, the trigger disengages from the internal motion mechanism during most of the drawer's opening stroke, and the buffer does not operate. Only during the final stage of the drawer's closing stroke does the trigger engage with the motion mechanism, pulling the elastic element within the module and compressing the damping element. The elastic element provides a gentle closing force, while the damping element absorbs energy, achieving a silent and smooth automatic closing. This design transforms the complex buffering triggering logic into a sophisticated mechanical structure, achieving a "plug-and-play" buffering effect without affecting the original smooth sliding experience of the drawer slide.

[0029] The following will be combined with the appendix Figures 1 to 6 The technical solutions defined in this application are described in detail.

[0030] This embodiment provides a three-section concealed slide rail with an external buffer damper, such as... Figure 1 and Figure 6 As shown, its main body consists of three synchronously retractable rails: an upper rail 100, a middle rail 200, and a lower rail 300. The lower rail 300 is used to fix it to the side panel of the cabinet, the middle rail 200 slides inside the lower rail 300, and the upper rail 100 slides inside the middle rail 200. The upper rail 100 is used to fix the drawer. The upper rail 100, middle rail 200, and lower rail 300 slide synchronously through the meshing of gears and racks. This is a common technology for three-section concealed drawer slides and will not be elaborated further here.

[0031] The core improvement of this application lies in the addition of an external buffer damper. For example... Figure 2 and Figure 3 As shown, the buffer damper mainly comprises a housing 900. The housing 900 extends along its length direction (i.e., Figure 2 The upper rail 100 is fixedly installed on its side in a manner consistent with the extension and retraction direction of the slide rail (left-right direction). In this embodiment, the preferred installation position is on the outer side of the upper rail 100, with the top of the housing 900 flush with the top of the upper rail. This makes full use of space, does not affect the concealment characteristics of the slide rail, and also provides reinforced support for the drawer.

[0032] Inside the housing 900, a slide groove 950 is provided along its length. The slide groove 950 is a guide rail used to constrain the movement path of the internal moving parts.

[0033] A lower rail connector 310 is fixedly installed on the lower rail 300. For example... Figure 2 As shown, the lower rail connector 310 is preferably a circular protrusion, which is welded or riveted to the bottom of the lower rail 300 by an upwardly bent fixing plate 311 and extends upward so that its end corresponds in space to the movement path inside the housing 900.

[0034] A slider 940 engages with a groove 950 via a protrusion (such as the end of a pivot shaft), thereby achieving a sliding fit with the groove 950. The lower part of the slider 940 is provided with a latch 941, which is a groove or hook-like structure that opens downward or to the side, for accommodating and hooking the lower rail connector 310 at a specific position.

[0035] like Figure 4 As shown, an elastic element 910 and a damping element 920 are also provided inside the housing 900. In this embodiment, the elastic element 910 is preferably a tension spring, which stores and releases elastic potential energy to provide a closing force. In this embodiment, the damping element 920 is preferably a hydraulic damping rod, which generates resistance through the throttling effect of the liquid, absorbing energy to achieve buffering. The elastic element 910 and the damping element 920 are arranged side by side, and the directions of their axes of action are parallel to the extension direction of the slide rail 950. The elastic element 910 and the damping element 920 are installed inside the housing 900 near the opening direction of the slide rail (i.e.,...). Figure 2 The front end of the elastic element 910 (left side). The movable ends of the elastic element 910 and the damping element 920 (i.e., the hook end of the tension spring and the drive rod end of the damping rod) are connected to a drive block 930.

[0036] The drive block 930 and the slider 940 are connected in a movable manner. In a preferred embodiment, such as... Figure 4 and Figure 5 As shown, the drive block 930 is rotatably connected to the slider 940 via a rotating shaft structure. The end of the rotating shaft structure forms a protrusion that extends into the slide groove 950, thus achieving both rotatable connection and sliding guidance through the cooperation between the protrusion and the slide groove 950.

[0037] The chute 950 is not a simple straight chute, but consists of two sections: a horizontal section 951 and a locking section 952 that connects to the end of the horizontal section 951. The extension direction of the locking section 952 forms a distinct angle with the extension direction of the horizontal section 951.

[0038] This unique chute configuration is key to achieving the functionality of this application. Its working principle combines...Figure 2 , Figure 5 and Figure 6 The description is as follows: Initial closed state ( Figure 2 When the drawer is fully closed, the lower rail connector 310, which is fixed to the lower rail 300, is precisely locked in the slot 941 of the slider 940.

[0039] Opening process: The user pulls the drawer outward, and the upper rail 100 moves the housing 900 fixed to it to the left (opening direction). At this time, because the lower rail connector 310 is engaged in the latch 941, the slider 940 and the drive block 930 are "held" by the lower rail connector 310, and move to the right (closing direction) relative to the moving housing 900. This movement stretches the elastic element 910 through the drive block 930 and pulls out the drive rod of the damping element 920, thereby storing energy in the elastic element 910 and the damping element 920. This process occurs within the initial short stroke of the slide rail opening.

[0040] Disengagement and Locking Figure 5 , Figure 6 When slider 940 is pulled to the end of horizontal section 951, guided by groove 950, the protrusion on slider 940 slides into locking section 952. Since locking section 952 has a different extension direction than horizontal section (e.g., upward and slightly to the left), the overall position of slider 940 is firmly defined by the groove wall of locking section 952, preventing it from sliding freely horizontally. Simultaneously, the posture of slider 940 changes, and the opening direction of its latch 941 deflects, no longer aligning with the movement trajectory of lower rail connector 310. At this time, lower rail connector 310 naturally disengages from latch 941, as... Figure 6 As shown. Afterwards, continue pulling the drawer open; the internal mechanism of the damper remains stationary (locked) and no longer generates resistance.

[0041] Closure and buffering (from) Figures 6 to 2 The user pushes the drawer to close. During most of the closing stroke, the lower rail connector 310 fails to engage with the latch 941, and the damper does not function. When the drawer reaches the final stage of its closing stroke, the lower rail connector 310 contacts the latch 941 again on its path. Guided by the inclined guide surface 9411 on one side of the latch 941, the lower rail connector 310 smoothly slides into the latch 941, pushing the slider 940 from the locking section 952 back to the horizontal section 951. Once the slider 940 returns to the horizontal section, the stretched elastic element 910 begins to contract, pulling the housing 900 (i.e., the upper rail 100 and the drawer) in the closing direction via the drive block 930 and the slider 940. Simultaneously, the drive rod of the damping element 920 is slowly pushed back, providing uniform buffering resistance until the drawer is fully closed (returning to the horizontal section). Figure 2 state).

[0042] Through the above structure, this application successfully restricts the buffering function to the end of the closing phase, achieving the ideal effect of "easy opening and gentle closing".

[0043] To facilitate the modular and convenient installation of the buffer damper onto the upper rail 100, this application employs a split, pre-assembled, riveted fastening structure. For example... Figure 2 and Figure 3 As shown, the structure includes a rivet nut 970 pre-fixed to the upper rail 100 and a fastener 980 for final locking, typically a nut.

[0044] The installation process is divided into two stages: In the first stage, a rivet nut 970 is inserted from the inside into a pre-set mounting hole on the side wall or bottom of the upper rail 100, so that the threaded part passes through the mounting hole and the head is locked into the inner wall of the upper rail. Then, on the inside of the upper rail 100, a rivet tool is used to rivet the end of the threaded part that passes through the hole, causing the end to deform and expand, thereby permanently and firmly fixing the rivet nut 970 to the upper rail 100, and its threaded part becomes a reliable connecting post perpendicular to the wall of the upper rail 100.

[0045] In the second stage, when installing the buffer damper onto the slide rail, simply align the pre-set mounting holes on the housing 900 and insert the threaded rod of the rivet nut 970, which is already fixed on the upper rail 100. Finally, screw the fastener 980 (e.g., a nut) into the housing 900 from the outside and tighten it to firmly press and fix the housing 900 onto the upper rail 100.

[0046] The advantages of this installation method are as follows: First, the riveting process, which requires specialized tools (rivet gun), is completed in advance on the slide rail production line, simplifying subsequent assembly. Second, the pre-fixed rivet nut 970 acts as a precise positioning pin, making the installation and alignment of the housing 900 very simple and quick. Finally, the threaded connection (bolt and nut) provides a stable and adjustable clamping force, ensuring the strength and reliability of the connection.

[0047] In this embodiment, the rivet nut 970 is inserted and fixed during the processing stage of the upper rail 100, so that the bending shape after processing does not affect the installation of the rivet nut 970.

[0048] To ensure reliable motion, a rotary connection is used between the drive block 930 and the slider 940. For example... Figure 4 and Figure 5As shown, a shaft hole is provided on the slider 940, and a shaft shoulder is correspondingly provided on the driving block 930. The two are connected by a rotating shaft. The two ends of the rotating shaft extend outwards to form convex columns, and these two convex columns are respectively embedded in the two side walls of the housing chute 950, becoming the main guiding points for the sliding of the slider assembly. This rotational connection can well adapt to the attitude change of the slider when entering the inclined locking section from the horizontal section, ensuring smooth movement.

[0049] To enable the lower rail connecting member 310 to be more reliably and smoothly engaged with the bayonet 941 at the end of closing, as Figure 4 shown, on one inner wall of the bayonet 941 facing the direction of the slide rail closing (i.e., Figure 4 the right side in

[0050] ), an inclined guiding surface 9411 is machined. This guiding surface 9411 plays a guiding and leading role. When the lower rail connecting member 310 contacts the bayonet 941, it can slide along this inclined surface to the bottom of the bayonet, effectively avoiding jamming or abnormal noise caused by hard collision.

[0050] The lower rail connecting member 310 is preferably a round convex column. As Figure 2 shown, its mounting structure includes a fixing plate 311. The fixing plate 311 is firmly fixed to the bottom of the lower rail 300 by resistance welding or riveting process. The front end of the fixing plate 311 is bent upwards, and the round convex column (lower rail connecting member 310) is fixed on this bent part. This "fixing plate + round convex column" structure has higher mounting accuracy and stronger shear resistance compared with the traditional directly welded dialing pin, ensuring long-term and precise cooperation with the slider bayonet 941.

[0051] To achieve effective detachment and locking, in this embodiment, as Figure 5 shown, the locking section 952 starts from the end of the horizontal section 951, extends upwards and towards the opening direction (left side) of the slide rail. This "upwardly tilted and outwardly flared" configuration can ensure that the slider 940 is lifted to a sufficient height, making its bayonet 941 completely deviate from the horizontal movement path of the lower rail connecting member 310, and at the same time using the groove wall to reliably circumferentially limit the slider to prevent it from accidentally sliding back.

[0052] In this embodiment, the length L of the horizontal section 951 of the chute 950 is designed to be less than the total stroke S of the upper rail 100 relative to the lower rail 300. That is, L < S. This means that the stroke during which the buffer is triggered and stores energy (corresponding to the length of the horizontal section) only accounts for a small part of the entire drawer stroke. This design ensures that the user cannot feel the existence of the buffer during most of the process of opening and closing the drawer, and the slide rail is still light and smooth, greatly improving the user experience.

[0053] As Figure 3 and Figure 4 shown, the housing 900 adopts a split design, including a base 901 and a cover plate 902.

[0054] The base 901 is integrally injection molded from plastic or metal, and its structure is designed to be asymmetrical. The base 901 is divided into a thick first part 9011 and a thinner second part 9012. The first part 9011 has an internal cavity to accommodate and limit the bodies of the elastic element 910 and the damping element 920. One side wall of the groove 950 is machined on the inner side wall of the second part 9012.

[0055] The cover plate 902 is detachably fixed to the second part 9012 of the base 901 by clips or screws. The inner side of the cover plate 902 forms the other side wall of the slide groove 950, which together with the groove wall on the base 901 forms a complete slide groove 950 track. When the cover plate 902 is installed, its outer surface is flush with the outer surface of the first part 9011 of the base 901, making the entire housing 900 have a flat appearance.

[0056] To achieve precise positioning of the damping element 920, a first limiting part 905 (e.g., a boss) is provided on the inner side of the junction of the first part 9011 and the second part 9012 of the base 901. Correspondingly, a second limiting part (not shown, e.g., another boss) is provided at the corresponding position on the inner side of the cover plate 902. When the cover plate 902 is closed, the first limiting part 905 and the second limiting part clamp the tail flange or specific structure of the damping element 920 body from both sides, thereby firmly limiting it axially to prevent it from moving during operation, while ensuring that its drive rod can accurately extend into the space of the second part 9012 and connect with the drive block 930.

[0057] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A three-section concealed slide rail with an external buffer damper, comprising an upper rail (100), a middle rail (200), and a lower rail (300), wherein the upper rail (100), the middle rail (200), and the lower rail (300) slide synchronously through the meshing of gears and racks, characterized in that, Also includes: A housing (900) is fixed to the upper rail (100), the length extension direction of the housing (900) is consistent with the extension and retraction direction of the slide rail; a slide groove (950) is provided inside the housing (900) along its length direction. A lower rail connector (310) is fixed to the lower rail (300) and extends to correspond to the housing (900); The slider (940) is slidably engaged with the groove (950), and the slider (940) is provided with a bayonet (941) for accommodating the lower rail connector (310). An elastic element (910) and a damping element (920) are disposed in the housing (900) along the extension direction of the slide groove (950) and located at the front end of the slide groove (950) in the slide rail opening direction. The movable ends of the two are connected to a driving block (930). The driving block (930) is movably connected to the slider (940) and can move linearly along the slide groove (950) with the slider (940). The groove (950) includes a horizontal section (951) and a locking section (952) communicating with the end of the horizontal section (951); the extending direction of the locking section (952) forms an angle with the extending direction of the horizontal section (951), and its configuration is such that when the slider (940) moves into the locking section (952), the slider (940) is limited to a fixed displacement position by the groove wall of the locking section (952), and the opening direction of the bayonet (941) changes accordingly, so that the lower rail connector (310) can disengage from the bayonet (941).

2. The three-section concealed slide rail with external buffer damper according to claim 1, characterized in that: The housing (900) is fixed to the side or bottom of the upper rail (100) by a riveting structure.

3. The three-section concealed slide rail with external buffer damper according to claim 2, characterized in that: The rivet structure includes a rivet nut (970) disposed on the upper rail (100) and a fastener (980) that cooperates with the rivet nut (970), and the housing (900) is locked and fixed by the fastener (980).

4. The three-section concealed slide rail with external buffer damper according to claim 1, characterized in that: The drive block (930) and the slider (940) are rotatably connected by a rotating shaft structure, and the end of the rotating shaft structure forms a protrusion that extends into the groove (950).

5. The three-section concealed slide rail with external buffer damper according to claim 1, characterized in that: The slider (940) has a bayonet (941) with an inclined guide surface (9411) on the side facing the closing direction of the slide rail.

6. The three-section concealed slide rail with external buffer damper according to claim 1, characterized in that: The lower rail connector (310) is a round protrusion; a fixed plate (311) that bends upward is fixed on the lower rail (300), and the round protrusion is located at the bend of the fixed plate (311).

7. The three-section concealed slide rail with external buffer damper according to claim 6, characterized in that: The fixing plate (311) is fixed to the bottom of the lower rail (300) by welding or riveting.

8. The three-section concealed slide rail with external buffer damper according to claim 1, characterized in that: The locking segment (952) extends upward from the end of the horizontal segment (951) and offsets in the direction of opening the slide rail.

9. The three-section concealed slide rail with external buffer damper according to claim 1, characterized in that: The length of the horizontal segment (951) is less than the total travel length of the upper rail (100) relative to the lower rail (300).

10. The three-section concealed slide rail with external buffer damper according to claim 1, characterized in that: The housing (900) includes a base (901) and a cover plate (902); The base (901) has an integrally formed first part (9011) and a second part (9012), the first part (9011) is used to accommodate the elastic member (910) and the damping member (920), and the thickness of the second part (9012) is less than that of the first part (9011). The cover plate (902) is detachably fixed to the second part (9012) of the base (901), and the inner side of the cover plate (902) and the inner side of the second part (9012) together form the two opposite groove walls of the slide (950). When the cover plate (902) is installed on the base (901), the outer surface of the cover plate (902) is flush with the outer surface of the first part (9011); At the junction of the first part (9011) and the second part (9012) of the base (901), a first limiting part (905) for axially limiting the body of the damping member (920) is provided. The inner side of the cover plate (902) is provided with a second limiting part for axially limiting the body of the damping member (920); The first limiting part (905) cooperates with the second limiting part to define the position of the damping member (920) body in the axial direction, while allowing its drive rod to extend into the second part (9012) and connect with the drive block (930).

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